memory leak fixes

lib/model/multipage.dart

@@ -9,6 +9,7 @@ class MultiPageInfo {
   final AvesEntry mainEntry;
   final List<SinglePageInfo> _pages;
   final Map<SinglePageInfo, AvesEntry> _pageEntries = {};
+  final Set<AvesEntry> _transientEntries = <AvesEntry>{};
 
   int get pageCount => _pages.length;
 
@@ -16,6 +17,13 @@ class MultiPageInfo {
     required this.mainEntry,
     required List<SinglePageInfo> pages,
   }) : _pages = pages {
+    if (kFlutterMemoryAllocationsEnabled) {
+      MemoryAllocations.instance.dispatchObjectCreated(
+        library: 'aves',
+        className: '$MultiPageInfo',
+        object: this,
+      );
+    }
     if (_pages.isNotEmpty) {
       _pages.sort();
       // make sure there is a page marked as default
@@ -34,6 +42,13 @@ class MultiPageInfo {
     }
   }
 
+  void dispose() {
+    if (kFlutterMemoryAllocationsEnabled) {
+      MemoryAllocations.instance.dispatchObjectDisposed(object: this);
+    }
+    _transientEntries.forEach((entry) => entry.dispose());
+  }
+
   factory MultiPageInfo.fromPageMaps(AvesEntry mainEntry, List<Map> pageMaps) {
     return MultiPageInfo(
       mainEntry: mainEntry,
@@ -91,7 +106,7 @@ class MultiPageInfo {
     // dynamically extracted video is not in the trash like the original motion photo
     final trashed = (mainEntry.isMotionPhoto && pageInfo.isVideo) ? false : mainEntry.trashed;
 
-    return AvesEntry(
+    final pageEntry = AvesEntry(
       id: mainEntry.id,
       uri: pageInfo.uri ?? mainEntry.uri,
       path: mainEntry.path,
@@ -117,6 +132,8 @@ class MultiPageInfo {
       )
       ..addressDetails = mainEntry.addressDetails?.copyWith()
       ..trashDetails = trashed ? mainEntry.trashDetails : null;
+    _transientEntries.add(pageEntry);
+    return pageEntry;
   }
 
   @override

lib/widgets/common/action_mixins/entry_storage.dart

@@ -9,6 +9,7 @@ import 'package:aves/model/filters/album.dart';
 import 'package:aves/model/filters/trash.dart';
 import 'package:aves/model/highlight.dart';
 import 'package:aves/model/metadata/date_modifier.dart';
+import 'package:aves/model/multipage.dart';
 import 'package:aves/model/settings/settings.dart';
 import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/model/source/collection_source.dart';
@@ -49,11 +50,13 @@ mixin EntryStorageMixin on FeedbackMixin, PermissionAwareMixin, SizeAwareMixin {
 
     if (!await checkFreeSpaceForMove(context, targetEntries, destinationAlbum, MoveType.export)) return;
 
+    final transientMultiPageInfo = <MultiPageInfo>{};
     final selection = <AvesEntry>{};
     await Future.forEach(targetEntries, (targetEntry) async {
       if (targetEntry.isMultiPage) {
         final multiPageInfo = await targetEntry.getMultiPageInfo();
         if (multiPageInfo != null) {
+          transientMultiPageInfo.add(multiPageInfo);
           if (targetEntry.isMotionPhoto) {
             await multiPageInfo.extractMotionPhotoVideo();
           }
@@ -130,6 +133,7 @@ mixin EntryStorageMixin on FeedbackMixin, PermissionAwareMixin, SizeAwareMixin {
         }
       },
     );
+    transientMultiPageInfo.forEach((v) => v.dispose());
   }
 
   Future<void> doQuickMove(

lib/widgets/viewer/multipage/controller.dart

@@ -50,6 +50,7 @@ class MultiPageController {
     if (kFlutterMemoryAllocationsEnabled) {
       MemoryAllocations.instance.dispatchObjectDisposed(object: this);
     }
+    _info?.dispose();
     _disposed = true;
     pageNotifier.dispose();
   }