fix(mobile): keep drag select going while the grid auto scrolls

.github/workflows/build-mobile.yml

@@ -103,7 +103,7 @@ jobs:
         working-directory: ./mobile
         run: printf "%s" $KEY_JKS | base64 -d > android/key.jks
 
-      - uses: actions/setup-java@1bcf9fb12cf4aa7d266a90ae39939e61372fe520 # v5.4.0
+      - uses: actions/setup-java@ad2b38190b15e4d6bdf0c97fb4fca8412226d287 # v5.3.0
         with:
           distribution: 'zulu'
           java-version: '17'
@@ -237,7 +237,7 @@ jobs:
         run: flutter build ios --config-only --no-codesign
 
       - name: Setup Ruby
-        uses: ruby/setup-ruby@9eb537ca036ebaed86729dcb9309076e4c5c3b74 # v1.314.0
+        uses: ruby/setup-ruby@89f90524b88a01fe6e0b732220432cc6142926af # v1.313.0
         with:
           ruby-version: '3.3'
           bundler-cache: true

.github/workflows/check-openapi.yml

@@ -25,7 +25,7 @@ jobs:
           persist-credentials: false
 
       - name: Check for breaking API changes
-        uses: oasdiff/oasdiff-action/breaking@ccc2442df0d99f8c419ed73e3de88641c91b3bc6 # v0.1.3
+        uses: oasdiff/oasdiff-action/breaking@e24529087d93f837b28b50bb66ba9016380a7fcc # v0.1.2
         with:
           base: https://raw.githubusercontent.com/${{ github.repository }}/main/open-api/immich-openapi-specs.json
           revision: open-api/immich-openapi-specs.json

.github/workflows/prepare-release.yml

@@ -149,7 +149,7 @@ jobs:
           github-token: ${{ steps.generate-token.outputs.token }}
 
       - name: Create draft release
-        uses: softprops/action-gh-release@718ea10b132b3b2eba29c1007bb80653f286566b # v3.0.1
+        uses: softprops/action-gh-release@b4309332981a82ec1c5618f44dd2e27cc8bfbfda # v3.0.0
         with:
           draft: true
           prerelease: ${{ needs.bump_version.outputs.rc }}

mobile/android/app/CMakeLists.txt

@@ -7,7 +7,6 @@ project(native_buffer LANGUAGES C)
 
 add_library(native_buffer SHARED
     src/main/cpp/native_buffer.c
-    src/main/cpp/native_image.c
 )
 
 target_link_libraries(native_buffer jnigraphics)

mobile/android/app/src/main/cpp/native_image.c

@@ -1,109 +0,0 @@
-#include <jni.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <android/bitmap.h>
-
-// Cache-friendly block size for the tiled rotation (in pixels). 32x32 uint32 = 4KB, fits L1.
-#define TILE 32
-
-// EXIF orientation values (androidx.exifinterface.media.ExifInterface.ORIENTATION_*).
-enum {
-  ORIENTATION_FLIP_HORIZONTAL = 2,
-  ORIENTATION_ROTATE_180 = 3,
-  ORIENTATION_FLIP_VERTICAL = 4,
-  ORIENTATION_TRANSPOSE = 5,
-  ORIENTATION_ROTATE_90 = 6,
-  ORIENTATION_TRANSVERSE = 7,
-  ORIENTATION_ROTATE_270 = 8,
-};
-
-// The orientations that swap width and height. Must stay in sync with affine_for's dim usage.
-static int swaps_dims(int o) {
-  return o == ORIENTATION_ROTATE_90 || o == ORIENTATION_ROTATE_270 ||
-         o == ORIENTATION_TRANSPOSE || o == ORIENTATION_TRANSVERSE;
-}
-
-// A source pixel (sx, sy) maps to destination index base + sx*stepX + sy*stepY, where dw is the
-// destination width. This affine form covers all 8 EXIF orientations and matches the pixel layout
-// of Bitmap.createBitmap(src, matrixForExifOrientation(o)). int64_t so it stays correct on
-// armeabi-v7a (32-bit long) regardless of how large MAX_RAW_DECODE_PIXELS grows.
-static void affine_for(int o, int sw, int sh, int dw, int64_t *base, int64_t *stepX, int64_t *stepY) {
-  switch (o) {
-    case ORIENTATION_ROTATE_90:       *base = sh - 1;                             *stepX = dw;  *stepY = -1;  break;
-    case ORIENTATION_ROTATE_270:      *base = (int64_t) (sw - 1) * dw;            *stepX = -dw; *stepY = 1;   break;
-    case ORIENTATION_ROTATE_180:      *base = (int64_t) (sh - 1) * dw + (sw - 1); *stepX = -1;  *stepY = -dw; break;
-    case ORIENTATION_FLIP_HORIZONTAL: *base = sw - 1;                             *stepX = -1;  *stepY = dw;  break;
-    case ORIENTATION_FLIP_VERTICAL:   *base = (int64_t) (sh - 1) * dw;            *stepX = 1;   *stepY = -dw; break;
-    case ORIENTATION_TRANSPOSE:       *base = 0;                                  *stepX = dw;  *stepY = 1;   break;
-    case ORIENTATION_TRANSVERSE:      *base = (int64_t) (sw - 1) * dw + (sh - 1); *stepX = -dw; *stepY = -1;  break;
-    default:                          *base = 0;                                  *stepX = 1;   *stepY = dw;  break;
-  }
-}
-
-// Copy each source pixel (whole uint32, so channel order/premult is irrelevant) to its rotated
-// destination, walking TILE x TILE blocks so the scattered writes of a 90/270 transpose stay
-// cache-resident. dst is densely packed (rowBytes == dw*4, no padding), which the affine math relies on.
-static void rotate_tiled(const uint8_t *src, int srcStride, uint32_t *dst,
-                         int sw, int sh, int64_t base, int64_t stepX, int64_t stepY) {
-  for (int ty = 0; ty < sh; ty += TILE) {
-    int yEnd = ty + TILE < sh ? ty + TILE : sh;
-    for (int tx = 0; tx < sw; tx += TILE) {
-      int xEnd = tx + TILE < sw ? tx + TILE : sw;
-      for (int sy = ty; sy < yEnd; sy++) {
-        const uint32_t *srcRow = (const uint32_t *) (src + (size_t) sy * srcStride);
-        int64_t idx = base + (int64_t) sy * stepY + (int64_t) tx * stepX;
-        for (int sx = tx; sx < xEnd; sx++) {
-          dst[idx] = srcRow[sx];
-          idx += stepX;
-        }
-      }
-    }
-  }
-}
-
-// Rotates an RGBA_8888 bitmap to the given EXIF orientation into a freshly malloc'd buffer (free it
-// via NativeBuffer.free). Fills outInfo with {width, height, rowBytes} and returns the buffer
-// address, or 0 if the bitmap can't be handled (e.g. a non-8888 format) so the caller can fall back.
-JNIEXPORT jlong JNICALL
-Java_app_alextran_immich_NativeImage_rotate(
-    JNIEnv *env, jclass clazz, jobject bitmap, jint orientation, jintArray outInfo) {
-  AndroidBitmapInfo info;
-  if (AndroidBitmap_getInfo(env, bitmap, &info) != ANDROID_BITMAP_RESULT_SUCCESS) {
-    return 0;
-  }
-  if (info.format != ANDROID_BITMAP_FORMAT_RGBA_8888) {
-    return 0;
-  }
-
-  int sw = (int) info.width;
-  int sh = (int) info.height;
-  int dw = swaps_dims(orientation) ? sh : sw;
-  int dh = swaps_dims(orientation) ? sw : sh;
-
-  uint32_t *dst = (uint32_t *) malloc((size_t) dw * dh * 4);
-  if (dst == NULL) {
-    return 0;
-  }
-
-  void *srcPixels = NULL;
-  if (AndroidBitmap_lockPixels(env, bitmap, &srcPixels) != ANDROID_BITMAP_RESULT_SUCCESS) {
-    free(dst);
-    return 0;
-  }
-
-  int64_t base, stepX, stepY;
-  affine_for(orientation, sw, sh, dw, &base, &stepX, &stepY);
-  rotate_tiled((const uint8_t *) srcPixels, (int) info.stride, dst, sw, sh, base, stepX, stepY);
-
-  AndroidBitmap_unlockPixels(env, bitmap);
-
-  jint dims[3] = {dw, dh, dw * 4};
-  (*env)->SetIntArrayRegion(env, outInfo, 0, 3, dims);
-  // Keep ownership in C until the buffer is safely handed back: if outInfo was somehow too small,
-  // SetIntArrayRegion left a pending exception and Kotlin will never receive (or free) dst.
-  if ((*env)->ExceptionCheck(env)) {
-    free(dst);
-    return 0;
-  }
-  return (jlong) dst;
-}

mobile/android/app/src/main/kotlin/app/alextran/immich/NativeImage.kt

@@ -1,19 +0,0 @@
-package app.alextran.immich
-
-import android.graphics.Bitmap
-
-object NativeImage {
-  init {
-    // rotate() is compiled into the native_buffer shared lib (which already links jnigraphics).
-    System.loadLibrary("native_buffer")
-  }
-
-  /**
-   * Rotates an RGBA_8888 [bitmap] to the given EXIF [orientation], writing the result into a freshly
-   * malloc'd native buffer. Returns the buffer address (free it with [NativeBuffer.free]) and fills
-   * [outInfo] with {width, height, rowBytes}. Returns 0 when the bitmap can't be handled (e.g. a
-   * non-8888 config) so the caller can fall back.
-   */
-  @JvmStatic
-  external fun rotate(bitmap: Bitmap, orientation: Int, outInfo: IntArray): Long
-}

mobile/android/app/src/main/kotlin/app/alextran/immich/images/LocalImagesImpl.kt

@@ -12,9 +12,7 @@ import android.provider.MediaStore.Images
 import android.provider.MediaStore.Video
 import android.util.Size
 import androidx.annotation.RequiresApi
-import androidx.exifinterface.media.ExifInterface
 import app.alextran.immich.NativeBuffer
-import app.alextran.immich.NativeImage
 import kotlin.math.*
 import java.io.IOException
 import java.util.concurrent.Executors
@@ -183,88 +181,35 @@ class LocalImagesImpl(context: Context) : LocalImageApi {
     val id = assetId.toLong()
 
     signal.throwIfCanceled()
+    val bitmap = if (isVideo) {
+      decodeVideoThumbnail(id, size, signal)
+    } else {
+      decodeImage(id, size, signal)
+    }
+
     try {
-      val res = if (isVideo) {
-        decodeVideoThumbnail(id, size, signal).toNativeBuffer()
-      } else {
-        val (bitmap, orientation) = decodeImage(id, size, signal)
-        signal.throwIfCanceled()
-        if (orientation == ExifInterface.ORIENTATION_NORMAL || orientation == ExifInterface.ORIENTATION_UNDEFINED) {
-          bitmap.toNativeBuffer()
-        } else {
-          rotateToNativeBuffer(bitmap, orientation, signal)
-        }
-      }
-      // Don't re-check cancellation here: res owns a malloc'd buffer, and bailing to CANCELLED would
-      // orphan it. Deliver it; Dart frees the buffer itself if the request was cancelled meanwhile.
+      signal.throwIfCanceled()
+      val res = bitmap.toNativeBuffer()
+      signal.throwIfCanceled()
       callback(Result.success(res))
     } catch (e: Exception) {
       callback(if (e is OperationCanceledException) CANCELLED else Result.failure(e))
     }
   }
 
-  // Returns the decoded bitmap plus the EXIF orientation that still needs applying. Only Q+ raw
-  // decodes come back unrotated (ImageDecoder / loadThumbnail skip EXIF for raw like DNG); every
-  // other path already orients itself, so it reports ORIENTATION_NORMAL.
-  private fun decodeImage(id: Long, size: Size, signal: CancellationSignal): Pair<Bitmap, Int> {
+  private fun decodeImage(id: Long, size: Size, signal: CancellationSignal): Bitmap {
     signal.throwIfCanceled()
     val uri = ContentUris.withAppendedId(Images.Media.EXTERNAL_CONTENT_URI, id)
-    val handleRaw = Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && isRawMime(uri)
-    val orientation = if (handleRaw) rawOrientation(uri) else ExifInterface.ORIENTATION_NORMAL
-
     if (size.width <= 0 || size.height <= 0 || size.width > 768 || size.height > 768) {
-      // A "load original" request is unsized -> a full-res decode (a sized > 768 just samples to target).
-      return decodeSource(uri, size, signal) to orientation
+      return decodeSource(uri, size, signal)
     }
 
-    val bitmap = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+    return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
       resolver.loadThumbnail(uri, size, signal)
     } else {
       signal.setOnCancelListener { Images.Thumbnails.cancelThumbnailRequest(resolver, id) }
       Images.Thumbnails.getThumbnail(resolver, id, Images.Thumbnails.MINI_KIND, OPTIONS)
     }
-    return bitmap to orientation
-  }
-
-  private fun isRawMime(uri: Uri): Boolean {
-    val mime = resolver.getType(uri) ?: return false
-    return mime.startsWith("image/x-") || mime == "image/dng"
-  }
-
-  private fun rawOrientation(uri: Uri): Int {
-    return resolver.openInputStream(uri)?.use {
-      ExifInterface(it).getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL)
-    } ?: ExifInterface.ORIENTATION_NORMAL
-  }
-
-  // ImageDecoder / loadThumbnail skip EXIF orientation for raw (e.g. DNG) on Q+, so the decoded
-  // bitmap comes back unrotated. Rotate it into the output buffer in native code (one pass, no
-  // intermediate rotated bitmap).
-  private fun rotateToNativeBuffer(bitmap: Bitmap, orientation: Int, signal: CancellationSignal): Map<String, Long> {
-    signal.throwIfCanceled()
-    // Force ARGB_8888: the native rotate needs a lockable 8888 buffer, and toNativeBuffer() below
-    // allocates width*height*4 (an F16/HDR decode would otherwise under-allocate). No-op for the
-    // common already-8888 case.
-    val src = if (bitmap.config != Bitmap.Config.ARGB_8888) {
-      val converted = bitmap.copy(Bitmap.Config.ARGB_8888, false)
-      bitmap.recycle()
-      converted ?: throw IOException("could not convert bitmap to ARGB_8888")
-    } else {
-      bitmap
-    }
-    try {
-      val info = IntArray(3)
-      val pointer = NativeImage.rotate(src, orientation, info)
-      if (pointer == 0L) throw IOException("native rotate failed for orientation $orientation")
-      return mapOf(
-        "pointer" to pointer,
-        "width" to info[0].toLong(),
-        "height" to info[1].toLong(),
-        "rowBytes" to info[2].toLong()
-      )
-    } finally {
-      if (!src.isRecycled) src.recycle()
-    }
   }
 
   private fun decodeVideoThumbnail(id: Long, target: Size, signal: CancellationSignal): Bitmap {

mobile/lib/domain/services/timeline.service.dart

@@ -182,6 +182,18 @@ class TimelineService {
     return _buffer.slice(start, start + count);
   }
 
+  /// Reads a range without disturbing the buffer; queries the source if it isn't resident.
+  Future<List<BaseAsset>> getAssetsRange(int index, int count) async {
+    if (index < 0 || count <= 0 || index >= _totalAssets) {
+      return const [];
+    }
+    final clamped = math.min(count, _totalAssets - index);
+    if (hasRange(index, clamped)) {
+      return getAssets(index, clamped);
+    }
+    return _assetSource(index, clamped);
+  }
+
   // Preload assets around the given index for asset viewer
   Future<void> preloadAssets(int index) => _mutex.run(() => _loadAssets(index, math.min(5, _totalAssets - index)));
 

mobile/lib/presentation/widgets/timeline/drag_selection_controller.dart

@@ -0,0 +1,175 @@
+import 'dart:collection';
+
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+
+// Tracks the [anchor..current] range selected by a drag. The in-buffer part of
+// each tick is selected synchronously so it follows the finger without racing;
+// the rare beyond-buffer part is read async (applied only if still in range) and
+// [end] reads whatever is still missing so the final range always lands.
+class DragSelectionController {
+  DragSelectionController({required this.getAssetSafe, required this.getAssetsRange, required this.onChange});
+
+  final BaseAsset? Function(int index) getAssetSafe;
+  final Future<List<BaseAsset>> Function(int index, int count) getAssetsRange;
+  final void Function(Set<BaseAsset> select, Set<BaseAsset> deselect) onChange;
+
+  final HashMap<int, BaseAsset> _selected = HashMap();
+  // Indices the buffer didn't hold yet (the edge outran the async buffer-load on a
+  // fast scroll); read in by _extendPending and guaranteed by end().
+  final Set<int> _pending = {};
+  int? _anchor;
+  int? _lo;
+  int? _hi;
+  bool _disposed = false;
+
+  // Call before starting a new drag so a previous drag's in-flight read can't
+  // leak into the new selection.
+  void dispose() => _disposed = true;
+
+  void _emit(Set<BaseAsset> select, Set<BaseAsset> deselect) {
+    if (_disposed) {
+      return;
+    }
+    onChange(select, deselect);
+  }
+
+  void start(int anchor) {
+    _selected.clear();
+    _pending.clear();
+    _anchor = anchor;
+    _lo = anchor;
+    _hi = anchor;
+    _select(anchor);
+    _extendPending();
+  }
+
+  void enter(int current) {
+    final anchor = _anchor;
+    if (anchor == null || _lo == null || _hi == null) {
+      return;
+    }
+    final ns = current < anchor ? current : anchor;
+    final ne = current < anchor ? anchor : current;
+    final ps = _lo!;
+    final pe = _hi!;
+    if (ns == ps && ne == pe) {
+      return;
+    }
+
+    final toSelect = <BaseAsset>{};
+    final toDeselect = <BaseAsset>{};
+
+    _forEach(ps, ns - 1, (k) => _removeIndex(k, toDeselect));
+    _forEach(ne + 1, pe, (k) => _removeIndex(k, toDeselect));
+    _forEach(ns, ps - 1, (k) => _addIndex(k, toSelect));
+    _forEach(pe + 1, ne, (k) => _addIndex(k, toSelect));
+
+    _lo = ns;
+    _hi = ne;
+
+    if (toSelect.isNotEmpty || toDeselect.isNotEmpty) {
+      _emit(toSelect, toDeselect);
+    }
+    _extendPending();
+  }
+
+  Future<void> end() async {
+    final lo = _lo;
+    final hi = _hi;
+    if (lo == null || hi == null) {
+      return;
+    }
+    final missing = <int>[];
+    for (var k = lo; k <= hi; k++) {
+      if (!_selected.containsKey(k)) {
+        missing.add(k);
+      }
+    }
+    if (missing.isEmpty) {
+      return;
+    }
+    final from = missing.first;
+    final assets = await getAssetsRange(from, missing.last - from + 1);
+    final missingSet = missing.toSet();
+    final toSelect = <BaseAsset>{};
+    for (var i = 0; i < assets.length; i++) {
+      final idx = from + i;
+      if (missingSet.contains(idx) && !_selected.containsKey(idx)) {
+        _selected[idx] = assets[i];
+        _pending.remove(idx);
+        toSelect.add(assets[i]);
+      }
+    }
+    if (toSelect.isNotEmpty) {
+      _emit(toSelect, const {});
+    }
+  }
+
+  void _select(int index) {
+    final asset = getAssetSafe(index);
+    if (asset != null) {
+      _selected[index] = asset;
+      _pending.remove(index);
+      _emit({asset}, const {});
+    } else {
+      _pending.add(index);
+    }
+  }
+
+  void _addIndex(int index, Set<BaseAsset> toSelect) {
+    if (_selected.containsKey(index)) {
+      return;
+    }
+    final asset = getAssetSafe(index);
+    if (asset != null) {
+      _selected[index] = asset;
+      _pending.remove(index);
+      toSelect.add(asset);
+    } else {
+      _pending.add(index);
+    }
+  }
+
+  void _removeIndex(int index, Set<BaseAsset> toDeselect) {
+    _pending.remove(index);
+    final asset = _selected.remove(index);
+    if (asset != null) {
+      toDeselect.add(asset);
+    }
+  }
+
+  Future<void> _extendPending() async {
+    if (_pending.isEmpty) {
+      return;
+    }
+    var from = _pending.first;
+    var to = _pending.first;
+    for (final k in _pending) {
+      if (k < from) {
+        from = k;
+      }
+      if (k > to) {
+        to = k;
+      }
+    }
+    final assets = await getAssetsRange(from, to - from + 1);
+    final toSelect = <BaseAsset>{};
+    for (var i = 0; i < assets.length; i++) {
+      final idx = from + i;
+      if (_pending.contains(idx) && _lo != null && idx >= _lo! && idx <= _hi!) {
+        _selected[idx] = assets[i];
+        toSelect.add(assets[i]);
+      }
+    }
+    _pending.removeWhere((idx) => _selected.containsKey(idx));
+    if (toSelect.isNotEmpty) {
+      _emit(toSelect, const {});
+    }
+  }
+
+  void _forEach(int lo, int hi, void Function(int) fn) {
+    for (var k = lo; k <= hi; k++) {
+      fn(k);
+    }
+  }
+}

mobile/lib/presentation/widgets/timeline/timeline.widget.dart

@@ -1,5 +1,4 @@
 import 'dart:async';
-import 'dart:collection';
 import 'dart:math' as math;
 
 import 'package:collection/collection.dart';
@@ -8,7 +7,6 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
-import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
 import 'package:immich_mobile/domain/models/events.model.dart';
 import 'package:immich_mobile/domain/models/timeline.model.dart';
 import 'package:immich_mobile/domain/utils/event_stream.dart';
@@ -20,6 +18,7 @@ import 'package:immich_mobile/presentation/widgets/timeline/constants.dart';
 import 'package:immich_mobile/presentation/widgets/timeline/scrubber.widget.dart';
 import 'package:immich_mobile/presentation/widgets/timeline/segment.model.dart';
 import 'package:immich_mobile/presentation/widgets/timeline/timeline.state.dart';
+import 'package:immich_mobile/presentation/widgets/timeline/drag_selection_controller.dart';
 import 'package:immich_mobile/presentation/widgets/timeline/timeline_drag_region.dart';
 import 'package:immich_mobile/providers/infrastructure/readonly_mode.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/settings.provider.dart';
@@ -29,6 +28,27 @@ import 'package:immich_mobile/widgets/common/immich_sliver_app_bar.dart';
 import 'package:immich_mobile/widgets/common/mesmerizing_sliver_app_bar.dart';
 import 'package:immich_mobile/widgets/common/selection_sliver_app_bar.dart';
 
+// First asset index of the row shown at [offset]. Pure for testing.
+@visibleForTesting
+int? assetIndexAtOffset(
+  List<Segment> segments,
+  double offset, {
+  required int columnCount,
+  required double maxScrollExtent,
+}) {
+  final clamped = offset.clamp(0.0, maxScrollExtent);
+  final segment = segments.findByOffset(clamped) ?? segments.lastOrNull;
+  if (segment == null) {
+    return null;
+  }
+  final rowIndex = segment.getMinChildIndexForScrollOffset(clamped);
+  if (rowIndex > segment.firstIndex) {
+    final rowIndexInSegment = rowIndex - (segment.firstIndex + 1);
+    return segment.firstAssetIndex + rowIndexInSegment * columnCount;
+  }
+  return segment.firstAssetIndex;
+}
+
 class Timeline extends StatelessWidget {
   const Timeline({
     super.key,
@@ -140,9 +160,10 @@ class _SliverTimelineState extends ConsumerState<_SliverTimeline> {
   StreamSubscription? _eventSubscription;
 
   // Drag selection state
+  static const _autoScrollStep = 175.0;
+  static const _autoScrollDuration = Duration(milliseconds: 125);
   bool _dragging = false;
-  TimelineAssetIndex? _dragAnchorIndex;
-  final Set<BaseAsset> _draggedAssets = HashSet();
+  DragSelectionController? _dragController;
   ScrollPhysics? _scrollPhysics;
 
   int _perRow = 4;
@@ -226,26 +247,18 @@ class _SliverTimelineState extends ConsumerState<_SliverTimeline> {
     EventStream.shared.emit(MultiSelectToggleEvent(isEnabled));
   }
 
-  int? _getCurrentAssetIndex(List<Segment> segments) {
-    final currentOffset = _scrollController.offset.clamp(0.0, _scrollController.position.maxScrollExtent);
-    final segment = segments.findByOffset(currentOffset) ?? segments.lastOrNull;
-    int? targetAssetIndex;
-    if (segment != null) {
-      final rowIndex = segment.getMinChildIndexForScrollOffset(currentOffset);
-      if (rowIndex > segment.firstIndex) {
-        final rowIndexInSegment = rowIndex - (segment.firstIndex + 1);
-        final assetsPerRow = ref.read(timelineArgsProvider).columnCount;
-        final assetIndexInSegment = rowIndexInSegment * assetsPerRow;
-        targetAssetIndex = segment.firstAssetIndex + assetIndexInSegment;
-      } else {
-        targetAssetIndex = segment.firstAssetIndex;
-      }
-    }
-    return targetAssetIndex;
-  }
+  int? _getCurrentAssetIndex(List<Segment> segments) => _assetIndexAtOffset(segments, _scrollController.offset);
+
+  int? _assetIndexAtOffset(List<Segment> segments, double offset) => assetIndexAtOffset(
+    segments,
+    offset,
+    columnCount: ref.read(timelineArgsProvider).columnCount,
+    maxScrollExtent: _scrollController.position.maxScrollExtent,
+  );
 
   @override
   void dispose() {
+    _dragController?.dispose();
     _scrollController.dispose();
     _eventSubscription?.cancel();
     super.dispose();
@@ -295,9 +308,21 @@ class _SliverTimelineState extends ConsumerState<_SliverTimeline> {
 
   // Drag selection methods
   void _setDragStartIndex(TimelineAssetIndex index) {
+    // Stop the old drag's controller so its in-flight read can't leak into this one.
+    _dragController?.dispose();
+    final timelineService = ref.read(timelineServiceProvider);
+    _dragController = DragSelectionController(
+      getAssetSafe: timelineService.getAssetSafe,
+      getAssetsRange: timelineService.getAssetsRange,
+      onChange: (select, deselect) {
+        if (!mounted) {
+          return;
+        }
+        ref.read(multiSelectProvider.notifier).selectRange(select, deselect);
+      },
+    )..start(index.assetIndex);
     setState(() {
       _scrollPhysics = const ClampingScrollPhysics();
-      _dragAnchorIndex = index;
       _dragging = true;
     });
   }
@@ -313,8 +338,12 @@ class _SliverTimelineState extends ConsumerState<_SliverTimeline> {
     });
     setState(() {
       _dragging = false;
-      _draggedAssets.clear();
     });
+    // Apply the full final range even if a read is still in flight on lift.
+    final finishing = _dragController?.end();
+    if (finishing != null) {
+      unawaited(finishing);
+    }
     final timelineState = ref.read(timelineStateProvider.notifier);
     Future.delayed(const Duration(milliseconds: 300), () {
       timelineState.setScrolling(false);
@@ -322,42 +351,33 @@ class _SliverTimelineState extends ConsumerState<_SliverTimeline> {
   }
 
   void _dragScroll(ScrollDirection direction) {
-    _scrollController.animateTo(
-      _scrollController.offset + (direction == ScrollDirection.forward ? 175 : -175),
-      duration: const Duration(milliseconds: 125),
-      curve: Curves.easeOut,
-    );
+    final position = _scrollController.position;
+    final step = direction == ScrollDirection.forward ? _autoScrollStep : -_autoScrollStep;
+    final target = (_scrollController.offset + step).clamp(0.0, position.maxScrollExtent);
+    _scrollController.animateTo(target, duration: _autoScrollDuration, curve: Curves.easeOut);
+
+    // A held finger emits no move events, so extend the selection to the asset
+    // at the leading edge of the scroll instead.
+    final controller = _dragController;
+    if (controller == null) {
+      return;
+    }
+    final segments = ref.read(timelineSegmentProvider).valueOrNull;
+    if (segments == null) {
+      return;
+    }
+    final edgeOffset = direction == ScrollDirection.forward ? target + position.viewportDimension : target;
+    final edgeIndex = _assetIndexAtOffset(segments, edgeOffset);
+    if (edgeIndex != null) {
+      controller.enter(edgeIndex);
+    }
   }
 
   void _handleDragAssetEnter(TimelineAssetIndex index) {
-    if (_dragAnchorIndex == null || !_dragging) {
+    if (!_dragging) {
       return;
     }
-
-    final timelineService = ref.read(timelineServiceProvider);
-    final dragAnchorIndex = _dragAnchorIndex!;
-
-    // Calculate the range of assets to select
-    final startIndex = math.min(dragAnchorIndex.assetIndex, index.assetIndex);
-    final endIndex = math.max(dragAnchorIndex.assetIndex, index.assetIndex);
-    final count = endIndex - startIndex + 1;
-
-    // Load the assets in the range
-    if (timelineService.hasRange(startIndex, count)) {
-      final selectedAssets = timelineService.getAssets(startIndex, count);
-
-      // Clear previous drag selection and add new range
-      final multiSelectNotifier = ref.read(multiSelectProvider.notifier);
-      for (final asset in _draggedAssets) {
-        multiSelectNotifier.deselectAsset(asset);
-      }
-      _draggedAssets.clear();
-
-      for (final asset in selectedAssets) {
-        multiSelectNotifier.selectAsset(asset);
-        _draggedAssets.add(asset);
-      }
-    }
+    _dragController?.enter(index.assetIndex);
   }
 
   @override

mobile/lib/providers/timeline/multiselect.provider.dart

@@ -97,6 +97,15 @@ class MultiSelectNotifier extends Notifier<MultiSelectState> {
     }
   }
 
+  // Drops the previous drag range and adds the new one in a single update. The
+  // full-set copy per drag tick is the accepted cost of immutable state.
+  void selectRange(Set<BaseAsset> toSelect, Set<BaseAsset> toDeselect) {
+    final selectedAssets = state.selectedAssets.toSet()
+      ..removeAll(toDeselect)
+      ..addAll(toSelect);
+    state = state.copyWith(selectedAssets: selectedAssets);
+  }
+
   void reset() {
     state = const MultiSelectState(selectedAssets: {}, lockedSelectionAssets: {}, forceEnable: false);
   }

mobile/test/flutter_test_config.dart

@@ -1,13 +0,0 @@
-import 'dart:async';
-
-import 'package:easy_localization/easy_localization.dart';
-import 'package:flutter/foundation.dart';
-import 'package:logging/logging.dart';
-
-Future<void> testExecutable(FutureOr<void> Function() testMain) async {
-  Logger.root.level = Level.OFF;
-  EasyLocalization.logger.enableBuildModes = [];
-  // ignore: banned-usage
-  debugPrint = (String? message, {int? wrapWidth}) {};
-  return testMain();
-}

mobile/test/modules/map/map_theme_override_test.dart

@@ -1,4 +1,5 @@
 @Skip('Flaky test, needs investigation')
+@Tags(['widget'])
 library;
 
 import 'package:drift/drift.dart';

mobile/test/unit/mocks.dart

@@ -1,10 +1,7 @@
 import 'dart:typed_data';
 
 import 'package:immich_mobile/constants/enums.dart';
-import 'package:immich_mobile/domain/models/album/local_album.model.dart';
-import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
 import 'package:immich_mobile/domain/models/user.model.dart';
-import 'package:immich_mobile/platform/native_sync_api.g.dart';
 import 'package:mocktail/mocktail.dart' as mock;
 import 'package:mocktail/mocktail.dart';
 
@@ -15,11 +12,11 @@ import 'factories/local_asset_factory.dart';
 import 'factories/user_factory.dart';
 
 class RepositoryMocks {
-  final localAlbum = LocalAlbumRepositoryStub(MockLocalAlbumRepository());
-  final localAsset = LocalAssetRepositoryStub(MockDriftLocalAssetRepository());
+  final localAlbum = MockLocalAlbumRepository();
+  final localAsset = MockDriftLocalAssetRepository();
   final trashedAsset = MockTrashedLocalAssetRepository();
 
-  final nativeApi = NativeSyncApiStub(MockNativeSyncApi());
+  final nativeApi = MockNativeSyncApi();
 
   RepositoryMocks() {
     resetAll();
@@ -27,34 +24,17 @@ class RepositoryMocks {
 
   void resetAll() {
     _registerFallbacks();
-    localAlbum.reset();
-    localAsset.reset();
+    reset(localAlbum);
+    reset(localAsset);
     reset(trashedAsset);
-    nativeApi.reset();
-    _stubLocalAlbumRepository();
-    _stubLocalAssetRepository();
-    _stubNativeSyncApi();
-  }
-
-  void _stubLocalAlbumRepository() {
-    when(localAlbum.getBackupAlbums).thenAnswer((_) async => []);
-    when(localAlbum.getAssetsToHash).thenAnswer((_) async => []);
-  }
-
-  void _stubLocalAssetRepository() {
-    when(localAsset.reconcileHashesFromCloudId).thenAnswer((_) async => {});
-    when(localAsset.updateHashes).thenAnswer((_) async => {});
-  }
-
-  void _stubNativeSyncApi() {
-    when(nativeApi.hashAssets).thenAnswer((_) async => []);
+    reset(nativeApi);
   }
 }
 
 class ServiceMocks {
-  final partner = PartnerServiceStub(MockPartnerService());
-  final user = UserServiceStub(MockUserService());
-  final asset = AssetServiceStub(MockAssetService());
+  final PartnerStub partner = PartnerStub(MockPartnerService());
+  final UserStub user = UserStub(MockUserService());
+  final asset = AssetStub(MockAssetService());
 
   ServiceMocks() {
     resetAll();
@@ -98,28 +78,11 @@ void _registerFallbacks() {
   registerFallbackValue(Uint8List(0));
 }
 
-extension type const Stub<T extends Mock>(T mockedClass) {
-  void reset() => mock.reset(mockedClass);
+extension type const Stub<T extends Mock>(T mockedService) {
+  void reset() => mock.reset(mockedService);
 }
 
-extension type const LocalAlbumRepositoryStub(MockLocalAlbumRepository repo) implements Stub<MockLocalAlbumRepository> {
-  Future<List<LocalAlbum>> Function() get getBackupAlbums =>
-      () => repo.getBackupAlbums();
-
-  Future<List<LocalAsset>> Function() get getAssetsToHash =>
-      () => repo.getAssetsToHash(any());
-}
-
-extension type const LocalAssetRepositoryStub(MockDriftLocalAssetRepository repo)
-    implements Stub<MockDriftLocalAssetRepository> {
-  Future<void> Function() get reconcileHashesFromCloudId =>
-      () => repo.reconcileHashesFromCloudId();
-
-  Future<void> Function() get updateHashes =>
-      () => repo.updateHashes(any());
-}
-
-extension type const PartnerServiceStub(MockPartnerService service) implements Stub<MockPartnerService> {
+extension type const PartnerStub(MockPartnerService service) implements Stub<MockPartnerService> {
   Stream<Iterable<User>> Function() get getCandidates =>
       () => service.getCandidates(any());
 
@@ -147,7 +110,7 @@ extension type const PartnerServiceStub(MockPartnerService service) implements S
       );
 }
 
-extension type const UserServiceStub(MockUserService service) implements Stub<MockUserService> {
+extension type const UserStub(MockUserService service) implements Stub<MockUserService> {
   UserDto Function() get getMyUser =>
       () => service.getMyUser();
 
@@ -164,12 +127,7 @@ extension type const UserServiceStub(MockUserService service) implements Stub<Mo
       () => service.createProfileImage(any(), any());
 }
 
-extension type const AssetServiceStub(MockAssetService service) implements Stub<MockAssetService> {
+extension type const AssetStub(MockAssetService service) implements Stub<MockAssetService> {
   Future<void> Function() get updateFavorite =>
       () => service.updateFavorite(any(), any());
 }
-
-extension type const NativeSyncApiStub(MockNativeSyncApi api) implements Stub<MockNativeSyncApi> {
-  Future<List<HashResult>> Function() get hashAssets =>
-      () => api.hashAssets(any(), allowNetworkAccess: any(named: 'allowNetworkAccess'));
-}

mobile/test/unit/presentation/actions/asset_debug_action_test.dart

@@ -6,7 +6,7 @@ import 'package:immich_mobile/presentation/actions/asset_debug.action.dart';
 import 'package:immich_ui/immich_ui.dart';
 
 import '../../factories/remote_asset_factory.dart';
-import '../presentation_context.dart';
+import '../../presentation_context.dart';
 
 void main() {
   late PresentationContext context;
@@ -23,8 +23,8 @@ void main() {
   group('AssetDebugAction', () {
     testWidgets('visible for a single asset when advanced troubleshooting is on', (tester) async {
       await tester.pumpTestWidget(
-        context,
         ActionIconButtonWidget(action: AssetDebugAction(assets: [RemoteAssetFactory.create()])),
+        overrides: context.overrides,
       );
 
       expect(find.byType(ImmichIconButton), findsOneWidget);
@@ -32,10 +32,10 @@ void main() {
 
     testWidgets('hidden for multiple assets', (tester) async {
       await tester.pumpTestWidget(
-        context,
         ActionIconButtonWidget(
           action: AssetDebugAction(assets: [RemoteAssetFactory.create(), RemoteAssetFactory.create()]),
         ),
+        overrides: context.overrides,
       );
 
       expect(find.byType(ImmichIconButton), findsNothing);
@@ -44,8 +44,8 @@ void main() {
     testWidgets('hidden when advanced troubleshooting is off', (tester) async {
       await StoreService.I.put(StoreKey.advancedTroubleshooting, false);
       await tester.pumpTestWidget(
-        context,
         ActionIconButtonWidget(action: AssetDebugAction(assets: [RemoteAssetFactory.create()])),
+        overrides: context.overrides,
       );
 
       expect(find.byType(ImmichIconButton), findsNothing);

mobile/test/unit/presentation/actions/favorite_action_test.dart

@@ -1,26 +1,30 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
 import 'package:immich_mobile/presentation/actions/favorite.action.dart';
+import 'package:immich_mobile/providers/infrastructure/asset.provider.dart';
 import 'package:mocktail/mocktail.dart';
 
-import '../../../domain/service.mock.dart';
 import '../../factories/remote_asset_factory.dart';
-import '../presentation_context.dart';
+import '../../presentation_context.dart';
 
 void main() {
   late PresentationContext context;
-  late MockAssetService assetService;
 
   setUp(() async {
     context = await PresentationContext.create();
-    assetService = context.service.asset.service;
   });
 
   tearDown(() {
     context.dispose();
   });
 
+  List<Override> overrides() => [
+    ...context.overrides,
+    assetServiceProvider.overrideWithValue(context.mocks.asset.service),
+  ];
+
   RemoteAsset owned({bool isFavorite = false}) =>
       RemoteAssetFactory.create(ownerId: context.currentUser.id, isFavorite: isFavorite);
 
@@ -28,48 +32,48 @@ void main() {
     testWidgets('favorites the eligible owned assets', (tester) async {
       final asset = owned();
 
-      await tester.pumpTestAction(context, FavoriteAction(assets: [asset]));
+      await tester.pumpTestAction(FavoriteAction(assets: [asset]), overrides: overrides());
 
-      verify(() => assetService.updateFavorite([asset.id], true)).called(1);
+      verify(() => context.mocks.asset.service.updateFavorite([asset.id], true)).called(1);
     });
 
     testWidgets('unfavorite the eligible owned assets', (tester) async {
       final asset = owned(isFavorite: true);
 
-      await tester.pumpTestAction(context, FavoriteAction(assets: [asset]));
+      await tester.pumpTestAction(FavoriteAction(assets: [asset]), overrides: overrides());
 
-      verify(() => assetService.updateFavorite([asset.id], false)).called(1);
+      verify(() => context.mocks.asset.service.updateFavorite([asset.id], false)).called(1);
     });
 
     testWidgets('ignores assets owned by someone else', (tester) async {
       final mine = owned();
       final theirs = RemoteAssetFactory.create();
 
-      await tester.pumpTestAction(context, FavoriteAction(assets: [mine, theirs]));
+      await tester.pumpTestAction(FavoriteAction(assets: [mine, theirs]), overrides: overrides());
 
-      verify(() => assetService.updateFavorite([mine.id], true)).called(1);
+      verify(() => context.mocks.asset.service.updateFavorite([mine.id], true)).called(1);
     });
 
     testWidgets('batches every eligible owned asset into a single call', (tester) async {
       final first = owned();
       final second = owned();
 
-      await tester.pumpTestAction(context, FavoriteAction(assets: [first, second]));
+      await tester.pumpTestAction(FavoriteAction(assets: [first, second]), overrides: overrides());
 
-      verify(() => assetService.updateFavorite([first.id, second.id], true)).called(1);
+      verify(() => context.mocks.asset.service.updateFavorite([first.id, second.id], true)).called(1);
     });
 
     testWidgets('skips owned assets already in the target state', (tester) async {
       final stale = owned();
       final alreadyFavorite = owned(isFavorite: true);
 
-      await tester.pumpTestAction(context, FavoriteAction(assets: [stale, alreadyFavorite]));
+      await tester.pumpTestAction(FavoriteAction(assets: [stale, alreadyFavorite]), overrides: overrides());
 
-      verify(() => assetService.updateFavorite([stale.id], true)).called(1);
+      verify(() => context.mocks.asset.service.updateFavorite([stale.id], true)).called(1);
     });
 
     testWidgets('shows a confirmation snackbar on success', (tester) async {
-      await tester.pumpTestAction(context, FavoriteAction(assets: [owned()]));
+      await tester.pumpTestAction(FavoriteAction(assets: [owned()]), overrides: overrides());
       await tester.pumpUntilFound(find.byType(SnackBar));
 
       expect(find.byType(SnackBar), findsOneWidget);

mobile/test/unit/presentation/actions/partner_action_test.dart

@@ -4,19 +4,17 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:immich_mobile/domain/models/user.model.dart';
 import 'package:immich_mobile/presentation/actions/partner.action.dart';
+import 'package:immich_mobile/providers/infrastructure/user.provider.dart';
 import 'package:mocktail/mocktail.dart';
 
-import '../../../domain/service.mock.dart';
 import '../../factories/user_factory.dart';
-import '../presentation_context.dart';
+import '../../presentation_context.dart';
 
 void main() {
   late PresentationContext context;
-  late MockPartnerService partnerService;
 
   setUp(() async {
     context = await PresentationContext.create();
-    partnerService = context.service.partner.service;
   });
 
   tearDown(() {
@@ -24,6 +22,8 @@ void main() {
   });
 
   List<Override> overrides({List<User> candidates = const []}) => [
+    ...context.overrides,
+    partnerServiceProvider.overrideWithValue(context.mocks.partner.service),
     candidatesStateProvider.overrideWith((ref) => Stream<Iterable<User>>.value(candidates)),
   ];
 
@@ -31,24 +31,22 @@ void main() {
     testWidgets('creates a partner for the selected candidate', (tester) async {
       final candidate = UserFactory.create();
 
-      await tester.pumpTestAction(context, const PartnerAddAction(), overrides: overrides(candidates: [candidate]));
+      await tester.pumpTestAction(const PartnerAddAction(), overrides: overrides(candidates: [candidate]));
       await tester.pumpUntilFound(find.text(candidate.name));
       await tester.tap(find.text(candidate.name));
       await tester.pumpAndSettle();
 
-      verify(() => partnerService.create(sharedById: context.currentUser.id, sharedWithId: candidate.id)).called(1);
+      verify(
+        () => context.mocks.partner.service.create(sharedById: context.currentUser.id, sharedWithId: candidate.id),
+      ).called(1);
     });
 
     testWidgets('creates nothing when the selection dialog is dismissed', (tester) async {
-      await tester.pumpTestAction(
-        context,
-        const PartnerAddAction(),
-        overrides: overrides(candidates: [UserFactory.create()]),
-      );
+      await tester.pumpTestAction(const PartnerAddAction(), overrides: overrides(candidates: [UserFactory.create()]));
       await tester.sendKeyEvent(LogicalKeyboardKey.escape); // dismiss without selecting
       await tester.pumpAndSettle();
 
-      verifyNever(context.service.partner.create);
+      verifyNever(context.mocks.partner.create);
     });
   });
 
@@ -56,27 +54,27 @@ void main() {
     testWidgets('deletes the partner after confirmation', (tester) async {
       final partner = UserFactory.create();
       await tester.pumpTestAction(
-        context,
         PartnerRemoveAction(sharedWithId: partner.id, partnerName: partner.name),
         overrides: overrides(),
       );
       await tester.tap(find.byType(TextButton).last); // confirm
       await tester.pumpAndSettle();
 
-      verify(() => partnerService.delete(sharedById: context.currentUser.id, sharedWithId: partner.id)).called(1);
+      verify(
+        () => context.mocks.partner.service.delete(sharedById: context.currentUser.id, sharedWithId: partner.id),
+      ).called(1);
     });
 
     testWidgets('deletes nothing when the confirmation is cancelled', (tester) async {
       final partner = UserFactory.create();
       await tester.pumpTestAction(
-        context,
         PartnerRemoveAction(sharedWithId: partner.id, partnerName: partner.name),
         overrides: overrides(),
       );
       await tester.tap(find.byType(TextButton).first); // cancel
       await tester.pumpAndSettle();
 
-      verifyNever(context.service.partner.delete);
+      verifyNever(context.mocks.partner.delete);
     });
   });
 }

mobile/test/unit/presentation/actions/timeline_action_test.dart

@@ -7,7 +7,7 @@ import 'package:immich_mobile/presentation/actions/timeline.action.dart';
 import 'package:immich_mobile/providers/timeline/multiselect.provider.dart';
 
 import '../../factories/remote_asset_factory.dart';
-import '../presentation_context.dart';
+import '../../presentation_context.dart';
 
 class _FakeAction extends BaseAction {
   _FakeAction({this.visible = true, this.error});
@@ -48,7 +48,8 @@ void main() {
     context.dispose();
   });
 
-  List<Override> overrides() => [
+  List<Override> seededOverrides() => [
+    ...context.overrides,
     multiSelectProvider.overrideWith(
       () => MultiSelectNotifier(
         MultiSelectState(selectedAssets: {RemoteAssetFactory.create()}, lockedSelectionAssets: const {}),
@@ -60,7 +61,6 @@ void main() {
     late ActionScope scope;
     late ProviderContainer container;
     await tester.pumpTestWidget(
-      context,
       Consumer(
         builder: (innerContext, ref, _) {
           scope = ActionScope(context: innerContext, ref: ref, authUser: context.currentUser);
@@ -68,7 +68,7 @@ void main() {
           return const SizedBox.shrink();
         },
       ),
-      overrides: overrides(),
+      overrides: seededOverrides(),
     );
     return (scope, container);
   }
@@ -97,8 +97,8 @@ void main() {
 
     testWidgets('delegates visibility to the wrapped action', (tester) async {
       await tester.pumpTestWidget(
-        context,
         ActionIconButtonWidget(action: TimelineAction(action: _FakeAction(visible: false))),
+        overrides: context.overrides,
       );
 
       expect(find.byType(ActionIconButtonWidget), findsOneWidget);

mobile/test/unit/presentation/partner_page_test.dart

@@ -7,7 +7,7 @@ import 'package:immich_mobile/presentation/actions/partner.action.dart';
 
 import '../factories/partner_user_factory.dart';
 import '../factories/user_factory.dart';
-import 'presentation_context.dart';
+import '../presentation_context.dart';
 
 void main() {
   late PresentationContext context;
@@ -19,7 +19,7 @@ void main() {
     testWidgets('shows the empty-state add button when there are no partners', (tester) async {
       final action = const PartnerAddAction();
 
-      await tester.pumpTestWidget(context, const PartnerSharedByList(partners: []));
+      await tester.pumpTestWidget(const PartnerSharedByList(partners: []), overrides: context.overrides);
 
       expect(find.byType(ListView), findsNothing);
       expect(find.widgetWithIcon(TextButton, action.icon), findsOneWidget);
@@ -28,7 +28,8 @@ void main() {
     testWidgets('renders a tile per partner with name and email', (tester) async {
       final partner1 = PartnerFactory.create();
       final partner2 = PartnerFactory.create();
-      await tester.pumpTestWidget(context, PartnerSharedByList(partners: [partner1, partner2]));
+      await tester.pumpTestWidget(PartnerSharedByList(partners: [partner1, partner2]), overrides: context.overrides);
+
       expect(find.byType(ListTile), findsNWidgets(2));
       expect(find.text(partner1.name), findsOneWidget);
       expect(find.text(partner1.email), findsOneWidget);
@@ -40,7 +41,7 @@ void main() {
       final partner1 = PartnerFactory.create(inTimeline: true);
       final partner2 = PartnerFactory.create();
       final action = const PartnerRemoveAction(sharedWithId: '', partnerName: '');
-      await tester.pumpTestWidget(context, PartnerSharedByList(partners: [partner1, partner2]));
+      await tester.pumpTestWidget(PartnerSharedByList(partners: [partner1, partner2]), overrides: context.overrides);
       expect(find.byIcon(action.icon), findsNWidgets(2));
     });
   });
@@ -61,12 +62,13 @@ void main() {
     }
 
     List<Override> withCandidates(List<User> candidates) => [
+      ...context.overrides,
       candidatesStateProvider.overrideWith((ref) => Stream<Iterable<User>>.value(candidates)),
     ];
 
     testWidgets('renders an option per candidate fetched from the provider', (tester) async {
       final user = UserFactory.create();
-      await tester.pumpTestWidget(context, dialogWidget(), overrides: withCandidates([user]));
+      await tester.pumpTestWidget(dialogWidget(), overrides: withCandidates([user]));
 
       await tester.tap(find.byKey(dialogButtonKey));
       await tester.pumpAndSettle();
@@ -76,7 +78,7 @@ void main() {
     });
 
     testWidgets('shows no options when the provider returns no candidates', (tester) async {
-      await tester.pumpTestWidget(context, dialogWidget(), overrides: withCandidates(const []));
+      await tester.pumpTestWidget(dialogWidget(), overrides: withCandidates(const []));
 
       await tester.tap(find.byKey(dialogButtonKey));
       await tester.pumpAndSettle();
@@ -87,11 +89,7 @@ void main() {
     testWidgets('pops the selected candidate when an option is tapped', (tester) async {
       final user = UserFactory.create();
       User? selected;
-      await tester.pumpTestWidget(
-        context,
-        dialogWidget(onClosed: (user) => selected = user),
-        overrides: withCandidates([user]),
-      );
+      await tester.pumpTestWidget(dialogWidget(onClosed: (user) => selected = user), overrides: withCandidates([user]));
 
       await tester.tap(find.byKey(dialogButtonKey));
       await tester.pumpAndSettle();

mobile/test/unit/presentation/widgets/timeline/asset_index_at_offset_test.dart

@@ -0,0 +1,60 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:immich_mobile/domain/models/timeline.model.dart';
+import 'package:immich_mobile/presentation/widgets/timeline/fixed/segment.model.dart';
+import 'package:immich_mobile/presentation/widgets/timeline/segment.model.dart';
+import 'package:immich_mobile/presentation/widgets/timeline/timeline.widget.dart';
+
+void main() {
+  // Two day-segments, 4 columns, 8 assets each (2 rows). header 50, tile 100, no spacing.
+  //   A: header@[0,50)  rows@50,150   assets 0..7    offset [0,250]
+  //   B: header@[250,300) rows@300,400 assets 8..15  offset [250,500]
+  const columnCount = 4;
+  const maxScrollExtent = 500.0;
+  final segments = <Segment>[
+    const FixedSegment(
+      firstIndex: 0,
+      lastIndex: 2,
+      startOffset: 0,
+      endOffset: 250,
+      firstAssetIndex: 0,
+      bucket: Bucket(assetCount: 8),
+      tileHeight: 100,
+      columnCount: columnCount,
+      headerExtent: 50,
+      spacing: 0,
+      header: HeaderType.day,
+    ),
+    const FixedSegment(
+      firstIndex: 3,
+      lastIndex: 5,
+      startOffset: 250,
+      endOffset: 500,
+      firstAssetIndex: 8,
+      bucket: Bucket(assetCount: 8),
+      tileHeight: 100,
+      columnCount: columnCount,
+      headerExtent: 50,
+      spacing: 0,
+      header: HeaderType.day,
+    ),
+  ];
+
+  int? at(double offset) =>
+      assetIndexAtOffset(segments, offset, columnCount: columnCount, maxScrollExtent: maxScrollExtent);
+
+  test('maps an offset to the first asset of the row shown there', () {
+    expect(at(0), 0); // top of segment A
+    expect(at(150), 4); // second row of A
+    expect(at(350), 8); // first row of B
+    expect(at(450), 12); // second row of B
+  });
+
+  test('clamps offsets outside the scroll range', () {
+    expect(at(-100), 0); // below the top -> first asset
+    expect(at(9999), at(maxScrollExtent)); // past the end -> same as the max offset
+  });
+
+  test('returns null for empty segments', () {
+    expect(assetIndexAtOffset(const [], 100, columnCount: columnCount, maxScrollExtent: maxScrollExtent), isNull);
+  });
+}

mobile/test/unit/presentation/widgets/timeline/drag_selection_controller_test.dart

@@ -0,0 +1,157 @@
+import 'dart:async';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:immich_mobile/presentation/widgets/timeline/drag_selection_controller.dart';
+
+import '../../../factories/remote_asset_factory.dart';
+
+void main() {
+  const total = 50;
+  late List<BaseAsset> all;
+  late Set<int> inBuffer; // indices getAssetSafe resolves synchronously
+  late List<Completer<List<BaseAsset>>> reads; // pending async reads, completed manually
+  late List<({int from, int count})> readArgs;
+  late Set<BaseAsset> selected;
+  late DragSelectionController sut;
+
+  Set<BaseAsset> range(int lo, int hi) => {for (var i = lo; i <= hi; i++) all[i]};
+
+  void completeRead(int i) {
+    final a = readArgs[i];
+    reads[i].complete([for (var k = a.from; k < a.from + a.count && k < total; k++) all[k]]);
+  }
+
+  Future<void> settle() => Future(() {});
+
+  setUp(() {
+    all = List.generate(total, (i) => RemoteAssetFactory.create(id: 'a${i.toString().padLeft(3, '0')}'));
+    inBuffer = {for (var i = 0; i < total; i++) i}; // default: everything buffered (sync)
+    reads = [];
+    readArgs = [];
+    selected = {};
+    sut = DragSelectionController(
+      getAssetSafe: (i) => inBuffer.contains(i) ? all[i] : null,
+      getAssetsRange: (from, count) {
+        final c = Completer<List<BaseAsset>>();
+        reads.add(c);
+        readArgs.add((from: from, count: count));
+        return c.future;
+      },
+      onChange: (select, deselect) {
+        selected
+          ..addAll(select)
+          ..removeAll(deselect);
+      },
+    );
+  });
+
+  group('live selection (all in buffer, synchronous)', () {
+    test('dragging down selects the whole range as it grows', () {
+      sut.start(2);
+      sut.enter(6);
+      sut.enter(12);
+      expect(selected, range(2, 12));
+      expect(reads, isEmpty, reason: 'everything buffered -> no async read');
+    });
+
+    test('dragging back up toward the anchor deselects the shrunk tail', () {
+      sut.start(2);
+      sut.enter(12);
+      expect(selected, range(2, 12));
+      sut.enter(6); // reverse
+      expect(selected, range(2, 6));
+      sut.enter(3); // reverse more
+      expect(selected, range(2, 3));
+    });
+
+    test('dragging past the anchor flips the range', () {
+      sut.start(10);
+      sut.enter(14);
+      expect(selected, range(10, 14));
+      sut.enter(7); // crosses the anchor
+      expect(selected, range(7, 10));
+    });
+  });
+
+  group('beyond-buffer (async)', () {
+    setUp(() => inBuffer = {}); // nothing buffered -> every tile needs an async read
+
+    test('drag-end fills the full range even if every live read is still in flight', () async {
+      sut.start(0);
+      sut.enter(20);
+      // simulate the real-rate race: none of the in-drag reads have completed
+      expect(selected, isEmpty);
+
+      final ending = sut.end();
+      // end() issues its own read for the missing range; complete it
+      completeRead(reads.length - 1);
+      await ending;
+
+      expect(selected, range(0, 20), reason: 'final range must always apply on drag-end');
+    });
+
+    test('out-of-order live read completions never corrupt the selection', () async {
+      sut.start(0); // issues read for [0,1]
+      sut.enter(10); // issues read for [0,11]
+      sut.enter(20); // issues read for [0,21]
+      expect(reads.length, 3);
+
+      // complete newest first, then older ones (out of order)
+      completeRead(2);
+      await settle();
+      completeRead(1);
+      await settle();
+      completeRead(0);
+      await settle();
+
+      expect(selected, range(0, 20));
+
+      final ending = sut.end();
+      await ending; // nothing missing -> no extra read
+      expect(selected, range(0, 20));
+    });
+
+    test('a disposed controller never emits when its in-flight read resolves', () async {
+      sut.start(0); // read [0,1] (pending, in flight)
+      sut.enter(20); // read [0,21] (pending, in flight)
+      expect(selected, isEmpty);
+
+      // a new drag starts -> the old controller is disposed
+      final ending = sut.end(); // issues end()'s fill read
+      sut.dispose();
+
+      // every in-flight read for the old controller now resolves
+      for (var i = 0; i < reads.length; i++) {
+        if (!reads[i].isCompleted) {
+          completeRead(i);
+        }
+      }
+      await ending;
+      await settle();
+
+      expect(selected, isEmpty, reason: 'a disposed controller must not leak into the new selection');
+    });
+
+    test('a late read for tiles dragged back out of range is ignored', () async {
+      sut.start(0); // read [0,1]
+      sut.enter(20); // read [0,21]
+      sut.enter(5); // shrink back; read [0,6]
+      // complete the stale wide read AFTER the shrink
+      completeRead(1); // [0,21]
+      await settle();
+      // indices 6..20 left the range -> must not be selected
+      expect(selected.intersection(range(6, 20)), isEmpty);
+
+      final ending = sut.end();
+      // complete any read end() issued for the (now smaller) missing range
+      for (var i = 0; i < reads.length; i++) {
+        if (!reads[i].isCompleted) {
+          completeRead(i);
+        }
+      }
+      await ending;
+      expect(selected, range(0, 5));
+    });
+  });
+}

mobile/test/unit/presentation_context.dart

@@ -13,21 +13,16 @@ import 'package:immich_mobile/infrastructure/repositories/db.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/store.repository.dart';
 import 'package:immich_mobile/presentation/actions/action.dart';
 import 'package:immich_mobile/presentation/actions/action.widget.dart';
-import 'package:immich_mobile/providers/infrastructure/asset.provider.dart';
-import 'package:immich_mobile/providers/infrastructure/user.provider.dart';
 import 'package:immich_mobile/providers/user.provider.dart';
 import 'package:immich_ui/immich_ui.dart';
 import 'package:mocktail/mocktail.dart';
 
-import '../../test_utils.dart';
-import '../factories/user_factory.dart';
-import '../mocks.dart';
+import '../test_utils.dart';
+import 'factories/user_factory.dart';
+import 'mocks.dart';
 
 class PresentationContext {
-  PresentationContext._({required UserDto user})
-    : currentUser = user,
-      service = ServiceMocks(),
-      repository = RepositoryMocks() {
+  PresentationContext._({required UserDto user}) : currentUser = user, mocks = ServiceMocks() {
     setup();
   }
 
@@ -36,14 +31,9 @@ class PresentationContext {
   static Drift? _db;
 
   final UserDto currentUser;
-  final ServiceMocks service;
-  final RepositoryMocks repository;
+  final ServiceMocks mocks;
 
-  List<Override> get overrides => [
-    currentUserProvider.overrideWith((ref) => CurrentUserProvider(service.user.service)),
-    assetServiceProvider.overrideWithValue(service.asset.service),
-    partnerServiceProvider.overrideWithValue(service.partner.service),
-  ];
+  List<Override> get overrides => [currentUserProvider.overrideWith((ref) => CurrentUserProvider(mocks.user.service))];
 
   static Future<PresentationContext> create() async {
     TestUtils.init();
@@ -57,18 +47,18 @@ class PresentationContext {
   }
 
   void setup() {
-    when(service.user.tryGetMyUser).thenReturn(currentUser);
+    when(mocks.user.tryGetMyUser).thenReturn(currentUser);
   }
 
   void dispose() {
     addTearDown(() {
-      service.resetAll();
+      mocks.resetAll();
     });
   }
 }
 
 extension PumpPresentationWidget on WidgetTester {
-  Future<void> pumpTestWidget(PresentationContext context, Widget widget, {List<Override> overrides = const []}) async {
+  Future<void> pumpTestWidget(Widget widget, {List<Override> overrides = const []}) async {
     await pumpWidget(
       EasyLocalization(
         supportedLocales: locales.values.toList(),
@@ -79,7 +69,7 @@ extension PumpPresentationWidget on WidgetTester {
         useFallbackTranslations: true,
         assetLoader: const CodegenLoader(),
         child: ProviderScope(
-          overrides: [...context.overrides, ...overrides],
+          overrides: overrides,
           child: Builder(
             builder: (context) => MaterialApp(
               debugShowCheckedModeBanner: false,
@@ -96,12 +86,8 @@ extension PumpPresentationWidget on WidgetTester {
     await pumpAndSettle();
   }
 
-  Future<void> pumpTestAction(
-    PresentationContext context,
-    BaseAction action, {
-    List<Override> overrides = const [],
-  }) async {
-    await pumpTestWidget(context, ActionIconButtonWidget(action: action), overrides: overrides);
+  Future<void> pumpTestAction(BaseAction action, {List<Override> overrides = const []}) async {
+    await pumpTestWidget(ActionIconButtonWidget(action: action), overrides: overrides);
     await tap(find.byType(ImmichIconButton));
     await pump();
   }

mobile/test/unit/services/hash_service_test.dart

@@ -14,11 +14,14 @@ void main() {
 
   setUp(() {
     sut = HashService(
-      localAlbumRepository: mocks.localAlbum.repo,
-      localAssetRepository: mocks.localAsset.repo,
-      nativeSyncApi: mocks.nativeApi.api,
+      localAlbumRepository: mocks.localAlbum,
+      localAssetRepository: mocks.localAsset,
+      nativeSyncApi: mocks.nativeApi,
       trashedLocalAssetRepository: mocks.trashedAsset,
     );
+
+    when(() => mocks.localAsset.reconcileHashesFromCloudId()).thenAnswer((_) async => {});
+    when(() => mocks.localAsset.updateHashes(any())).thenAnswer((_) async => {});
   });
 
   tearDown(() {
@@ -29,20 +32,22 @@ void main() {
     group('hashAssets', () {
       test('skips albums with no assets to hash', () async {
         final album = LocalAlbumFactory.create(assetCount: 0);
-        when(mocks.localAlbum.getBackupAlbums).thenAnswer((_) async => [album]);
+        when(() => mocks.localAlbum.getBackupAlbums()).thenAnswer((_) async => [album]);
+        when(() => mocks.localAlbum.getAssetsToHash(album.id)).thenAnswer((_) async => []);
 
         await sut.hashAssets();
 
-        verifyNever(mocks.nativeApi.hashAssets);
+        verifyNever(() => mocks.nativeApi.hashAssets(any(), allowNetworkAccess: any(named: 'allowNetworkAccess')));
       });
 
       test('skips empty batches', () async {
         final album = LocalAlbumFactory.create();
-        when(mocks.localAlbum.getBackupAlbums).thenAnswer((_) async => [album]);
+        when(() => mocks.localAlbum.getBackupAlbums()).thenAnswer((_) async => [album]);
+        when(() => mocks.localAlbum.getAssetsToHash(album.id)).thenAnswer((_) async => []);
 
         await sut.hashAssets();
 
-        verifyNever(mocks.nativeApi.hashAssets);
+        verifyNever(() => mocks.nativeApi.hashAssets(any(), allowNetworkAccess: any(named: 'allowNetworkAccess')));
       });
 
       test('processes assets when available', () async {
@@ -50,17 +55,15 @@ void main() {
         final asset = LocalAssetFactory.create();
         final result = HashResult(assetId: asset.id, hash: 'test-hash');
 
-        when(mocks.localAlbum.getBackupAlbums).thenAnswer((_) async => [album]);
-        when(() => mocks.localAlbum.repo.getAssetsToHash(album.id)).thenAnswer((_) async => [asset]);
-        when(
-          () => mocks.nativeApi.api.hashAssets([asset.id], allowNetworkAccess: false),
-        ).thenAnswer((_) async => [result]);
+        when(() => mocks.localAlbum.getBackupAlbums()).thenAnswer((_) async => [album]);
+        when(() => mocks.localAlbum.getAssetsToHash(album.id)).thenAnswer((_) async => [asset]);
+        when(() => mocks.nativeApi.hashAssets([asset.id], allowNetworkAccess: false)).thenAnswer((_) async => [result]);
 
         await sut.hashAssets();
 
-        verify(() => mocks.nativeApi.api.hashAssets([asset.id], allowNetworkAccess: false)).called(1);
+        verify(() => mocks.nativeApi.hashAssets([asset.id], allowNetworkAccess: false)).called(1);
         final captured =
-            verify(() => mocks.localAsset.repo.updateHashes(captureAny())).captured.first as Map<String, String>;
+            verify(() => mocks.localAsset.updateHashes(captureAny())).captured.first as Map<String, String>;
         expect(captured.length, 1);
         expect(captured[asset.id], result.hash);
       });
@@ -69,16 +72,16 @@ void main() {
         final album = LocalAlbumFactory.create();
         final asset = LocalAssetFactory.create();
 
-        when(mocks.localAlbum.getBackupAlbums).thenAnswer((_) async => [album]);
-        when(() => mocks.localAlbum.repo.getAssetsToHash(album.id)).thenAnswer((_) async => [asset]);
+        when(() => mocks.localAlbum.getBackupAlbums()).thenAnswer((_) async => [album]);
+        when(() => mocks.localAlbum.getAssetsToHash(album.id)).thenAnswer((_) async => [asset]);
         when(
-          () => mocks.nativeApi.api.hashAssets([asset.id], allowNetworkAccess: false),
+          () => mocks.nativeApi.hashAssets([asset.id], allowNetworkAccess: false),
         ).thenAnswer((_) async => [HashResult(assetId: asset.id, error: 'Failed to hash')]);
 
         await sut.hashAssets();
 
         final captured =
-            verify(() => mocks.localAsset.repo.updateHashes(captureAny())).captured.first as Map<String, String>;
+            verify(() => mocks.localAsset.updateHashes(captureAny())).captured.first as Map<String, String>;
         expect(captured.length, 0);
       });
 
@@ -86,25 +89,25 @@ void main() {
         final album = LocalAlbumFactory.create();
         final asset = LocalAssetFactory.create();
 
-        when(mocks.localAlbum.getBackupAlbums).thenAnswer((_) async => [album]);
-        when(() => mocks.localAlbum.repo.getAssetsToHash(album.id)).thenAnswer((_) async => [asset]);
+        when(() => mocks.localAlbum.getBackupAlbums()).thenAnswer((_) async => [album]);
+        when(() => mocks.localAlbum.getAssetsToHash(album.id)).thenAnswer((_) async => [asset]);
         when(
-          () => mocks.nativeApi.api.hashAssets([asset.id], allowNetworkAccess: false),
+          () => mocks.nativeApi.hashAssets([asset.id], allowNetworkAccess: false),
         ).thenAnswer((_) async => [HashResult(assetId: asset.id, hash: null)]);
 
         await sut.hashAssets();
 
         final captured =
-            verify(() => mocks.localAsset.repo.updateHashes(captureAny())).captured.first as Map<String, String>;
+            verify(() => mocks.localAsset.updateHashes(captureAny())).captured.first as Map<String, String>;
         expect(captured.length, 0);
       });
 
       test('batches by size limit', () async {
         const batchSize = 2;
         final sut = HashService(
-          localAlbumRepository: mocks.localAlbum.repo,
-          localAssetRepository: mocks.localAsset.repo,
-          nativeSyncApi: mocks.nativeApi.api,
+          localAlbumRepository: mocks.localAlbum,
+          localAssetRepository: mocks.localAsset,
+          nativeSyncApi: mocks.nativeApi,
           batchSize: batchSize,
           trashedLocalAssetRepository: mocks.trashedAsset,
         );
@@ -116,9 +119,12 @@ void main() {
 
         final capturedCalls = <List<String>>[];
 
-        when(mocks.localAlbum.getBackupAlbums).thenAnswer((_) async => [album]);
-        when(() => mocks.localAlbum.repo.getAssetsToHash(album.id)).thenAnswer((_) async => [asset1, asset2, asset3]);
-        when(mocks.nativeApi.hashAssets).thenAnswer((invocation) async {
+        when(() => mocks.localAsset.updateHashes(any())).thenAnswer((_) async => {});
+        when(() => mocks.localAlbum.getBackupAlbums()).thenAnswer((_) async => [album]);
+        when(() => mocks.localAlbum.getAssetsToHash(album.id)).thenAnswer((_) async => [asset1, asset2, asset3]);
+        when(() => mocks.nativeApi.hashAssets(any(), allowNetworkAccess: any(named: 'allowNetworkAccess'))).thenAnswer((
+          invocation,
+        ) async {
           final assetIds = invocation.positionalArguments[0] as List<String>;
           capturedCalls.add(List<String>.from(assetIds));
           return assetIds.map((id) => HashResult(assetId: id, hash: '$id-hash')).toList();
@@ -130,7 +136,7 @@ void main() {
         expect(capturedCalls[0], [asset1.id, asset2.id], reason: 'First call should batch the first two assets');
         expect(capturedCalls[1], [asset3.id], reason: 'Second call should have the remaining asset');
 
-        verify(() => mocks.localAsset.repo.updateHashes(any())).called(2);
+        verify(() => mocks.localAsset.updateHashes(any())).called(2);
       });
 
       test('handles mixed success and failure in batch', () async {
@@ -138,9 +144,9 @@ void main() {
         final asset1 = LocalAssetFactory.create();
         final asset2 = LocalAssetFactory.create();
 
-        when(mocks.localAlbum.getBackupAlbums).thenAnswer((_) async => [album]);
-        when(() => mocks.localAlbum.repo.getAssetsToHash(album.id)).thenAnswer((_) async => [asset1, asset2]);
-        when(() => mocks.nativeApi.api.hashAssets([asset1.id, asset2.id], allowNetworkAccess: false)).thenAnswer(
+        when(() => mocks.localAlbum.getBackupAlbums()).thenAnswer((_) async => [album]);
+        when(() => mocks.localAlbum.getAssetsToHash(album.id)).thenAnswer((_) async => [asset1, asset2]);
+        when(() => mocks.nativeApi.hashAssets([asset1.id, asset2.id], allowNetworkAccess: false)).thenAnswer(
           (_) async => [
             HashResult(assetId: asset1.id, hash: 'asset1-hash'),
             HashResult(assetId: asset2.id, error: 'Failed to hash asset2'),
@@ -150,7 +156,7 @@ void main() {
         await sut.hashAssets();
 
         final captured =
-            verify(() => mocks.localAsset.repo.updateHashes(captureAny())).captured.first as Map<String, String>;
+            verify(() => mocks.localAsset.updateHashes(captureAny())).captured.first as Map<String, String>;
         expect(captured.length, 1);
         expect(captured[asset1.id], 'asset1-hash');
       });
@@ -161,18 +167,20 @@ void main() {
         final asset1 = LocalAssetFactory.create();
         final asset2 = LocalAssetFactory.create();
 
-        when(mocks.localAlbum.getBackupAlbums).thenAnswer((_) async => [selectedAlbum, nonSelectedAlbum]);
-        when(() => mocks.localAlbum.repo.getAssetsToHash(selectedAlbum.id)).thenAnswer((_) async => [asset1]);
-        when(() => mocks.localAlbum.repo.getAssetsToHash(nonSelectedAlbum.id)).thenAnswer((_) async => [asset2]);
-        when(mocks.nativeApi.hashAssets).thenAnswer((invocation) async {
+        when(() => mocks.localAlbum.getBackupAlbums()).thenAnswer((_) async => [selectedAlbum, nonSelectedAlbum]);
+        when(() => mocks.localAlbum.getAssetsToHash(selectedAlbum.id)).thenAnswer((_) async => [asset1]);
+        when(() => mocks.localAlbum.getAssetsToHash(nonSelectedAlbum.id)).thenAnswer((_) async => [asset2]);
+        when(() => mocks.nativeApi.hashAssets(any(), allowNetworkAccess: any(named: 'allowNetworkAccess'))).thenAnswer((
+          invocation,
+        ) async {
           final assetIds = invocation.positionalArguments[0] as List<String>;
           return assetIds.map((id) => HashResult(assetId: id, hash: '$id-hash')).toList();
         });
 
         await sut.hashAssets();
 
-        verify(() => mocks.nativeApi.api.hashAssets([asset1.id], allowNetworkAccess: true)).called(1);
-        verify(() => mocks.nativeApi.api.hashAssets([asset2.id], allowNetworkAccess: false)).called(1);
+        verify(() => mocks.nativeApi.hashAssets([asset1.id], allowNetworkAccess: true)).called(1);
+        verify(() => mocks.nativeApi.hashAssets([asset2.id], allowNetworkAccess: false)).called(1);
       });
     });
   });

mobile/test/unit/services/timeline_service_test.dart

@@ -0,0 +1,100 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:immich_mobile/constants/constants.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:immich_mobile/domain/models/timeline.model.dart';
+import 'package:immich_mobile/domain/services/timeline.service.dart';
+
+import '../factories/remote_asset_factory.dart';
+
+void main() {
+  // total must exceed the sliding buffer so it cannot hold the whole library at once
+  const total = 2000;
+  late List<BaseAsset> all;
+  late TimelineService sut;
+
+  TimelineService buildService() {
+    all = List.generate(total, (i) => RemoteAssetFactory.create(id: 'a${i.toString().padLeft(5, '0')}'));
+    return TimelineService((
+      assetSource: (index, count) async {
+        final end = (index + count) > total ? total : index + count;
+        return all.sublist(index, end);
+      },
+      bucketSource: () => Stream.value([const Bucket(assetCount: total)]),
+      origin: TimelineOrigin.main,
+    ));
+  }
+
+  Future<void> settle() => Future.delayed(const Duration(milliseconds: 10));
+
+  setUp(() async {
+    sut = buildService();
+    await settle(); // let the bucket subscription load the first batch and set totalAssets
+  });
+
+  tearDown(() async {
+    await sut.dispose();
+  });
+
+  test('buffer holds the first batch but not the whole library', () {
+    expect(sut.totalAssets, total);
+    expect(sut.hasRange(0, kTimelineAssetLoadBatchSize), isTrue);
+    expect(sut.hasRange(0, total), isFalse);
+  });
+
+  // #27118 / #20855 mechanism: drag-selecting from a low anchor while the grid
+  // auto-scrolls down slides the buffer forward to follow the finger. once the
+  // buffer offset passes the anchor, hasRange(anchor, ...) is false and
+  // _handleDragAssetEnter silently stops extending the selection.
+  test('anchor drops out of the buffer after the grid scrolls down', () async {
+    const anchor = 5;
+    expect(sut.hasRange(anchor, 100), isTrue);
+
+    // the grid loads a far-down range as it auto-scrolls during the drag
+    await sut.loadAssets(1500, 1);
+
+    const current = 1500;
+    const count = current - anchor + 1;
+    expect(sut.hasRange(anchor, 1), isFalse, reason: 'anchor is now below the buffer offset');
+    expect(sut.hasRange(anchor, count), isFalse, reason: 'the full drag range is no longer resident');
+    expect(() => sut.getAssets(anchor, count), throwsRangeError);
+  });
+
+  // the fix: getAssetsRange returns the whole drag range regardless of the
+  // buffer position, so the selection keeps extending while scrolling.
+  group('getAssetsRange', () {
+    test('returns a buffered range', () async {
+      final assets = await sut.getAssetsRange(0, 50);
+      expect(assets.length, 50);
+      expect(assets.first, all[0]);
+      expect(assets.last, all[49]);
+    });
+
+    test('returns a range wider than the buffer', () async {
+      final assets = await sut.getAssetsRange(0, total);
+      expect(assets.length, total);
+      expect(assets.first, all[0]);
+      expect(assets.last, all[total - 1]);
+    });
+
+    test('returns the anchor range after the buffer scrolled past the anchor', () async {
+      const anchor = 5;
+      await sut.loadAssets(1500, 1); // buffer slides forward, dropping the anchor
+      expect(sut.hasRange(anchor, 1), isFalse);
+
+      const current = 1500;
+      const count = current - anchor + 1;
+      final assets = await sut.getAssetsRange(anchor, count);
+      expect(assets.length, count);
+      expect(assets.first, all[anchor]);
+      expect(assets.last, all[current]);
+    });
+
+    test('clamps a range that runs past the end and ignores invalid input', () async {
+      final tail = await sut.getAssetsRange(total - 10, 100);
+      expect(tail.length, 10);
+      expect(await sut.getAssetsRange(-1, 10), isEmpty);
+      expect(await sut.getAssetsRange(0, 0), isEmpty);
+      expect(await sut.getAssetsRange(total, 10), isEmpty);
+    });
+  });
+}

mobile/test/widget_tester_extensions.dart

@@ -1,51 +1,27 @@
-import 'package:easy_localization/easy_localization.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
-import 'package:immich_mobile/constants/locales.dart';
-import 'package:immich_mobile/generated/codegen_loader.g.dart';
 
 extension PumpConsumerWidget on WidgetTester {
-  /// Wraps the provided [widget] with a localized Material app such that it
-  /// becomes:
-  ///
-  /// EasyLocalization
-  ///   |-ProviderScope
-  ///     |-MaterialApp (localization delegates wired up)
-  ///       |-Material
-  ///         |-[widget]
+  /// Wraps the provided [widget] with Material app such that it becomes:
   ///
+  /// ProviderScope
+  ///   |-MaterialApp
+  ///     |-Material
+  ///       |-[widget]
   Future<void> pumpConsumerWidget(
     Widget widget, {
     Duration? duration,
     EnginePhase phase = EnginePhase.sendSemanticsUpdate,
     List<Override> overrides = const [],
   }) async {
-    await pumpWidget(
-      EasyLocalization(
-        supportedLocales: locales.values.toList(),
-        path: translationsPath,
-        startLocale: locales.values.first,
-        fallbackLocale: locales.values.first,
-        saveLocale: false,
-        useFallbackTranslations: true,
-        assetLoader: const CodegenLoader(),
-        child: ProviderScope(
-          overrides: overrides,
-          child: Builder(
-            builder: (context) => MaterialApp(
-              debugShowCheckedModeBanner: false,
-              localizationsDelegates: context.localizationDelegates,
-              supportedLocales: context.supportedLocales,
-              locale: context.locale,
-              home: Material(child: widget),
-            ),
-          ),
-        ),
+    return pumpWidget(
+      ProviderScope(
+        overrides: overrides,
+        child: MaterialApp(debugShowCheckedModeBanner: false, home: Material(child: widget)),
       ),
       duration: duration,
       phase: phase,
     );
-    await pumpAndSettle();
   }
 }

server/src/queries/search.repository.sql

@@ -7,17 +7,18 @@ from
   "asset"
   inner join "asset_exif" on "asset"."id" = "asset_exif"."assetId"
 where
-  "asset"."fileCreatedAt" >= $1
-  and "asset_exif"."lensModel" = $2
-  and "asset"."ownerId" = any ($3::uuid[])
-  and "asset"."isFavorite" = $4
+  "asset"."visibility" = $1
+  and "asset"."fileCreatedAt" >= $2
+  and "asset_exif"."lensModel" = $3
+  and "asset"."ownerId" = any ($4::uuid[])
+  and "asset"."isFavorite" = $5
   and "asset"."deletedAt" is null
 order by
   "asset"."fileCreatedAt" desc
 limit
-  $5
-offset
   $6
+offset
+  $7
 
 -- SearchRepository.searchStatistics
 select
@@ -26,10 +27,11 @@ from
   "asset"
   inner join "asset_exif" on "asset"."id" = "asset_exif"."assetId"
 where
-  "asset"."fileCreatedAt" >= $1
-  and "asset_exif"."lensModel" = $2
-  and "asset"."ownerId" = any ($3::uuid[])
-  and "asset"."isFavorite" = $4
+  "asset"."visibility" = $1
+  and "asset"."fileCreatedAt" >= $2
+  and "asset_exif"."lensModel" = $3
+  and "asset"."ownerId" = any ($4::uuid[])
+  and "asset"."isFavorite" = $5
   and "asset"."deletedAt" is null
 
 -- SearchRepository.searchRandom
@@ -39,15 +41,16 @@ from
   "asset"
   inner join "asset_exif" on "asset"."id" = "asset_exif"."assetId"
 where
-  "asset"."fileCreatedAt" >= $1
-  and "asset_exif"."lensModel" = $2
-  and "asset"."ownerId" = any ($3::uuid[])
-  and "asset"."isFavorite" = $4
+  "asset"."visibility" = $1
+  and "asset"."fileCreatedAt" >= $2
+  and "asset_exif"."lensModel" = $3
+  and "asset"."ownerId" = any ($4::uuid[])
+  and "asset"."isFavorite" = $5
   and "asset"."deletedAt" is null
 order by
   random()
 limit
-  $5
+  $6
 
 -- SearchRepository.searchLargeAssets
 select
@@ -57,16 +60,17 @@ from
   "asset"
   inner join "asset_exif" on "asset"."id" = "asset_exif"."assetId"
 where
-  "asset"."fileCreatedAt" >= $1
-  and "asset_exif"."lensModel" = $2
-  and "asset"."ownerId" = any ($3::uuid[])
-  and "asset"."isFavorite" = $4
+  "asset"."visibility" = $1
+  and "asset"."fileCreatedAt" >= $2
+  and "asset_exif"."lensModel" = $3
+  and "asset"."ownerId" = any ($4::uuid[])
+  and "asset"."isFavorite" = $5
   and "asset"."deletedAt" is null
-  and "asset_exif"."fileSizeInByte" > $5
+  and "asset_exif"."fileSizeInByte" > $6
 order by
   "asset_exif"."fileSizeInByte" desc
 limit
-  $6
+  $7
 
 -- SearchRepository.searchSmart
 begin
@@ -79,17 +83,18 @@ from
   inner join "asset_exif" on "asset"."id" = "asset_exif"."assetId"
   inner join "smart_search" on "asset"."id" = "smart_search"."assetId"
 where
-  "asset"."fileCreatedAt" >= $1
-  and "asset_exif"."lensModel" = $2
-  and "asset"."ownerId" = any ($3::uuid[])
-  and "asset"."isFavorite" = $4
+  "asset"."visibility" = $1
+  and "asset"."fileCreatedAt" >= $2
+  and "asset_exif"."lensModel" = $3
+  and "asset"."ownerId" = any ($4::uuid[])
+  and "asset"."isFavorite" = $5
   and "asset"."deletedAt" is null
 order by
-  smart_search.embedding <=> $5
+  smart_search.embedding <=> $6
 limit
-  $6
-offset
   $7
+offset
+  $8
 commit
 
 -- SearchRepository.getEmbedding

server/src/repositories/metadata.repository.ts

@@ -53,10 +53,10 @@ export interface ImmichTags extends Omit<Tags, TagsWithWrongTypes> {
     RegionList: {
       Area: {
         // (X,Y) // center of the rectangle
-        X: number | string;
-        Y: number | string;
-        W: number | string;
-        H: number | string;
+        X: number;
+        Y: number;
+        W: number;
+        H: number;
         Unit: string;
       };
       Rotation?: number;

server/src/repositories/search.repository.ts

@@ -117,8 +117,7 @@ type BaseAssetSearchOptions = SearchDateOptions &
   SearchAlbumOptions &
   SearchOcrOptions;
 
-export type AssetSearchOptions = Omit<BaseAssetSearchOptions, 'visibility'> &
-  SearchRelationOptions & { visibility?: AssetVisibility | 'not-locked' };
+export type AssetSearchOptions = BaseAssetSearchOptions & SearchRelationOptions;
 
 export type AssetSearchBuilderOptions = Omit<AssetSearchOptions, 'orderDirection'>;
 
@@ -126,11 +125,11 @@ export type SmartSearchOptions = SearchDateOptions &
   SearchEmbeddingOptions &
   SearchExifOptions &
   SearchOneToOneRelationOptions &
-  Omit<SearchStatusOptions, 'visibility'> &
+  SearchStatusOptions &
   SearchUserIdOptions &
   SearchPeopleOptions &
   SearchTagOptions &
-  SearchOcrOptions & { visibility?: AssetVisibility | 'not-locked' };
+  SearchOcrOptions;
 
 export type OcrSearchOptions = SearchDateOptions & SearchOcrOptions;
 

server/src/services/metadata.service.spec.ts

@@ -39,10 +39,7 @@ const forSidecarJob = (
   };
 };
 
-const makeFaceTags = (
-  face: Partial<{ Name: string }> = {},
-  orientation?: ImmichTags['Orientation'],
-): Partial<ImmichTags> => ({
+const makeFaceTags = (face: Partial<{ Name: string }> = {}, orientation?: ImmichTags['Orientation']) => ({
   Orientation: orientation,
   RegionInfo: {
     AppliedToDimensions: { W: 1000, H: 100, Unit: 'pixel' },
@@ -1374,35 +1371,6 @@ describe(MetadataService.name, () => {
       expect(mocks.person.updateAll).not.toHaveBeenCalled();
     });
 
-    it('should handle string coordinates in face region bounding box calculation by limiting to 16 decimal places', async () => {
-      const asset = AssetFactory.create();
-      const person = PersonFactory.create();
-
-      mocks.assetJob.getForMetadataExtraction.mockResolvedValue(getForMetadataExtraction(asset));
-      mocks.systemMetadata.get.mockResolvedValue({ metadata: { faces: { import: true } } });
-      const faceTags = makeFaceTags({ Name: person.name });
-
-      // Simulating EXIF returning a string with >16 decimal places
-      faceTags.RegionInfo!.RegionList[0].Area.X = '0.48564814814814824';
-      faceTags.RegionInfo!.RegionList[0].Area.W = '0.2';
-
-      mockReadTags(faceTags);
-      mocks.person.getDistinctNames.mockResolvedValue([]);
-      mocks.person.createAll.mockResolvedValue([person.id]);
-      mocks.person.update.mockResolvedValue(person);
-
-      await sut.handleMetadataExtraction({ id: asset.id });
-
-      expect(mocks.person.refreshFaces).toHaveBeenCalledWith(
-        [
-          expect.objectContaining({
-            boundingBoxX1: Math.floor((0.485_648_148_148_148_2 - 0.2 / 2) * 1000),
-          }),
-        ],
-        [],
-      );
-    });
-
     it('should apply metadata face tags creating new people', async () => {
       const asset = AssetFactory.create();
       const person = PersonFactory.create();

server/src/services/metadata.service.ts

@@ -854,13 +854,6 @@ export class MetadataService extends BaseService {
     // update area coordinates and dimensions in RegionList assuming "normalized" unit as per MWG guidelines
     const adjustedRegionList = regionInfo.RegionList.map((region) => {
       let { X, Y, W, H } = region.Area;
-
-      // EXIF floats with >16 decimals are serialized as strings. Ensure they are numbers.
-      X = Number(X);
-      Y = Number(Y);
-      W = Number(W);
-      H = Number(H);
-
       switch (orientation) {
         case ExifOrientation.MirrorHorizontal: {
           X = 1 - X;
@@ -933,21 +926,16 @@ export class MetadataService extends BaseService {
       const loweredName = region.Name.toLowerCase();
       const personId = existingNameMap.get(loweredName) || this.cryptoRepository.randomUUID();
 
-      const X = Number(region.Area.X);
-      const Y = Number(region.Area.Y);
-      const W = Number(region.Area.W);
-      const H = Number(region.Area.H);
-
       const face = {
         id: this.cryptoRepository.randomUUID(),
         personId,
         assetId: asset.id,
         imageWidth,
         imageHeight,
-        boundingBoxX1: Math.floor((X - W / 2) * imageWidth),
-        boundingBoxY1: Math.floor((Y - H / 2) * imageHeight),
-        boundingBoxX2: Math.floor((X + W / 2) * imageWidth),
-        boundingBoxY2: Math.floor((Y + H / 2) * imageHeight),
+        boundingBoxX1: Math.floor((region.Area.X - region.Area.W / 2) * imageWidth),
+        boundingBoxY1: Math.floor((region.Area.Y - region.Area.H / 2) * imageHeight),
+        boundingBoxX2: Math.floor((region.Area.X + region.Area.W / 2) * imageWidth),
+        boundingBoxY2: Math.floor((region.Area.Y + region.Area.H / 2) * imageHeight),
         sourceType: SourceType.Exif,
       };
 

server/src/services/search.service.spec.ts

@@ -250,7 +250,7 @@ describe(SearchService.name, () => {
       );
       expect(mocks.search.searchSmart).toHaveBeenCalledWith(
         { page: 1, size: 100 },
-        { query: 'test', embedding: '[1, 2, 3]', userIds: [authStub.user1.user.id], visibility: 'not-locked' },
+        { query: 'test', embedding: '[1, 2, 3]', userIds: [authStub.user1.user.id] },
       );
     });
 

server/src/services/search.service.ts

@@ -73,22 +73,14 @@ export class SearchService extends BaseService {
       checksum = Buffer.from(dto.checksum, encoding);
     }
 
-    let userIds: string[] | undefined;
-
-    if (dto.albumIds && dto.albumIds.length > 0) {
-      await this.requireAccess({ auth, ids: dto.albumIds, permission: Permission.AlbumRead });
-    } else {
-      userIds = await this.getUserIdsToSearch(auth, dto.visibility);
-    }
-
     const page = dto.page ?? 1;
     const size = dto.size || 250;
+    const userIds = await this.getUserIdsToSearch(auth, dto.visibility);
     const { hasNextPage, items } = await this.searchRepository.searchMetadata(
       { page, size },
       {
         ...dto,
         checksum,
-        visibility: dto.visibility ?? (auth.session?.hasElevatedPermission ? undefined : 'not-locked'),
         userIds,
         orderDirection: dto.order ?? AssetOrder.Desc,
       },
@@ -99,13 +91,9 @@ export class SearchService extends BaseService {
 
   async searchStatistics(auth: AuthDto, dto: StatisticsSearchDto): Promise<SearchStatisticsResponseDto> {
     const userIds = await this.getUserIdsToSearch(auth);
-    if (dto.visibility === AssetVisibility.Locked) {
-      requireElevatedPermission(auth);
-    }
 
     return await this.searchRepository.searchStatistics({
       ...dto,
-      visibility: dto.visibility ?? (auth.session?.hasElevatedPermission ? undefined : 'not-locked'),
       userIds,
     });
   }
@@ -126,11 +114,7 @@ export class SearchService extends BaseService {
     }
 
     const userIds = await this.getUserIdsToSearch(auth, dto.visibility);
-    const items = await this.searchRepository.searchLargeAssets(dto.size || 250, {
-      ...dto,
-      visibility: dto.visibility ?? (auth.session?.hasElevatedPermission ? undefined : 'not-locked'),
-      userIds,
-    });
+    const items = await this.searchRepository.searchLargeAssets(dto.size || 250, { ...dto, userIds });
     return items.map((item) => mapAsset(item, { auth }));
   }
 
@@ -171,12 +155,7 @@ export class SearchService extends BaseService {
     const size = dto.size || 100;
     const { hasNextPage, items } = await this.searchRepository.searchSmart(
       { page, size },
-      {
-        ...dto,
-        userIds: await userIds,
-        embedding,
-        visibility: dto.visibility ?? (auth.session?.hasElevatedPermission ? undefined : 'not-locked'),
-      },
+      { ...dto, userIds: await userIds, embedding },
     );
 
     return this.mapResponse(items, hasNextPage ? (page + 1).toString() : null, { auth });

server/src/utils/database.ts

@@ -373,15 +373,12 @@ const joinDeduplicationPlugin = new DeduplicateJoinsPlugin();
 
 export function searchAssetBuilder(kysely: Kysely<DB>, options: AssetSearchBuilderOptions) {
   options.withDeleted ||= !!(options.trashedAfter || options.trashedBefore || options.isOffline);
+  const visibility = options.visibility == null ? AssetVisibility.Timeline : options.visibility;
 
   return kysely
     .withPlugin(joinDeduplicationPlugin)
     .selectFrom('asset')
-    .$if(!!options.visibility, (qb) =>
-      options.visibility === 'not-locked'
-        ? qb.where('asset.visibility', '!=', AssetVisibility.Locked)
-        : qb.where('asset.visibility', '=', options.visibility!),
-    )
+    .where('asset.visibility', '=', visibility)
     .$if(!!options.albumIds && options.albumIds.length > 0, (qb) => inAlbums(qb, options.albumIds!))
     .$if(!!options.tagIds && options.tagIds.length > 0, (qb) => hasTags(qb, options.tagIds!))
     .$if(options.tagIds === null, (qb) =>

server/test/medium/specs/services/search.service.spec.ts

@@ -1,6 +1,5 @@
 import { Kysely } from 'kysely';
 import { SearchSuggestionType } from 'src/dtos/search.dto';
-import { AlbumUserRole, AssetVisibility } from 'src/enum';
 import { AccessRepository } from 'src/repositories/access.repository';
 import { AssetRepository } from 'src/repositories/asset.repository';
 import { DatabaseRepository } from 'src/repositories/database.repository';
@@ -109,71 +108,6 @@ describe(SearchService.name, () => {
       expect(response.assets.items.length).toBe(1);
       expect(response.assets.items[0].id).toBe(unstackedAsset.id);
     });
-
-    describe('visibility', () => {
-      it('should filter out locked assets in a default session', async () => {
-        const { sut, ctx } = setup();
-        const { user } = await ctx.newUser();
-
-        await ctx.newAsset({ ownerId: user.id, visibility: AssetVisibility.Locked });
-
-        const auth = factory.auth({ user: { id: user.id } });
-
-        const response = await sut.searchMetadata(auth, { withStacked: false });
-
-        expect(response.assets.items.length).toBe(0);
-      });
-
-      it('should return locked assets in an elevated session', async () => {
-        const { sut, ctx } = setup();
-        const { user } = await ctx.newUser();
-
-        await ctx.newAsset({ ownerId: user.id, visibility: AssetVisibility.Locked });
-
-        const auth = factory.auth({ user: { id: user.id }, session: { hasElevatedPermission: true } });
-
-        const response = await sut.searchMetadata(auth, { withStacked: false });
-
-        expect(response.assets.items.length).toBe(1);
-      });
-    });
-  });
-
-  describe('albumIds option', () => {
-    it('should return assets from shared album', async () => {
-      const { sut, ctx } = setup();
-      const { user } = await ctx.newUser();
-      const { user: otherUser } = await ctx.newUser();
-
-      const { asset } = await ctx.newAsset({ ownerId: otherUser.id });
-      const { album } = await ctx.newAlbum({ ownerId: otherUser.id });
-      await ctx.newAlbumAsset({ albumId: album.id, assetId: asset.id });
-      await ctx.newAlbumUser({ albumId: album.id, userId: user.id, role: AlbumUserRole.Editor });
-
-      const auth = factory.auth({ user: { id: user.id } });
-
-      const response = await sut.searchMetadata(auth, { albumIds: [album.id] });
-
-      expect(response.assets.items.length).toBe(1);
-    });
-
-    it('should not return assets for album, a user is not in, when partner sharing is enabled', async () => {
-      const { sut, ctx } = setup();
-      const { user } = await ctx.newUser();
-      const { user: otherUser } = await ctx.newUser();
-
-      await ctx.newPartner({ sharedById: otherUser.id, sharedWithId: user.id });
-
-      const { asset } = await ctx.newAsset({ ownerId: otherUser.id });
-      const { album } = await ctx.newAlbum({ ownerId: otherUser.id });
-      await ctx.newAlbumAsset({ albumId: album.id, assetId: asset.id });
-
-      const auth = factory.auth({ user: { id: user.id } });
-
-      await expect(sut.searchMetadata(auth, { albumIds: [album.id] })).rejects.toThrow(
-        'Not found or no album.read access',
-      );
-    });
   });
 
   describe('getSearchSuggestions', () => {

server/test/small.factory.ts

@@ -27,7 +27,7 @@ const authFactory = ({
   user,
 }: {
   apiKey?: Partial<AuthApiKey>;
-  session?: { id?: string; hasElevatedPermission?: boolean };
+  session?: { id: string };
   user?: Omit<
     Partial<UserAdmin>,
     'createdAt' | 'updatedAt' | 'deletedAt' | 'fileCreatedAt' | 'fileModifiedAt' | 'localDateTime' | 'profileChangedAt'
@@ -46,8 +46,8 @@ const authFactory = ({
 
   if (session) {
     auth.session = {
-      id: session.id ?? newUuid(),
-      hasElevatedPermission: session.hasElevatedPermission ?? false,
+      id: session.id,
+      hasElevatedPermission: false,
     };
   }