fix(home): 修复频道快速切换卡 loading

test/player/player_logic_test.dart

@@ -431,7 +431,7 @@ void main() {
       final activeBefore = logic.session.active;
 
       logic.updateFeed([...feed, _drama('third')], keepDramaId: 'signal');
-      await pumpEventQueue();
+      await logic.feedUpdateSettled;
 
       expect(logic.currentDramaId, 'signal');
       expect(logic.visibleIndices, [0, 1, 2]);
@@ -463,7 +463,7 @@ void main() {
         [_drama('city'), _drama('signal'), _drama('third')],
         keepDramaId: 'city',
       );
-      await pumpEventQueue();
+      await logic.feedUpdateSettled;
 
       expect(logic.currentDramaId, 'city');
       expect(logic.session.currentIndex, 0);
@@ -488,7 +488,11 @@ void main() {
       logic.start(factory: factory.create, coordinator: PlaybackCoordinator());
       await _drain(logic);
 
-      logic.updateFeed([_drama('anime-a'), _drama('anime-b')]);
+      logic.updateFeed(
+        [_drama('anime-a'), _drama('anime-b')],
+        resetToFirst: true,
+      );
+      await logic.feedUpdateSettled;
       await _drain(logic);
 
       expect(logic.queue.entryAt(0).drama.id, 'anime-a');
@@ -517,6 +521,7 @@ void main() {
       await _drain(logic);
 
       logic.updateFeed(const []);
+      await logic.feedUpdateSettled;
 
       expect(logic.queue.length, 0);
       expect(logic.visibleIndices, isEmpty);
@@ -524,6 +529,95 @@ void main() {
       logic.dispose();
       await _drain(logic);
     });
+
+    test('should_apply_only_latest_feed_when_update_is_called_five_times',
+        () async {
+      final factory = _RecordingFactory();
+      final logic = _logic(FakeWatchHistory());
+      final initial = [_drama('initial')];
+      logic.attach(
+        PlayerPage(
+          drama: initial.first,
+          initialIndex: 0,
+          homeMode: true,
+          feedDramas: initial,
+        ),
+        isMounted: () => true,
+      );
+      logic.start(factory: factory.create, coordinator: PlaybackCoordinator());
+      await _drain(logic);
+
+      for (var index = 1; index <= 5; index++) {
+        logic.updateFeed([_drama('feed-$index')], resetToFirst: true);
+      }
+      await logic.feedUpdateSettled;
+      await _drain(logic);
+
+      expect(logic.feedRevision, 5);
+      expect(logic.queue.entryAt(0).drama.id, 'feed-5');
+      expect(logic.sessionEpisodes.single.id, 'feed-5-1');
+      expect(logic.currentDramaId, 'feed-5');
+      logic.dispose();
+      await _drain(logic);
+    });
+
+    test('should_select_first_item_when_feed_recovers_from_empty', () async {
+      final factory = _RecordingFactory();
+      final feed = [_drama('signal')];
+      final logic = _logic(FakeWatchHistory());
+      logic.attach(
+        PlayerPage(
+          drama: feed.first,
+          initialIndex: 0,
+          homeMode: true,
+          feedDramas: feed,
+        ),
+        isMounted: () => true,
+      );
+      logic.start(factory: factory.create, coordinator: PlaybackCoordinator());
+      await _drain(logic);
+      logic.updateFeed(const []);
+      await logic.feedUpdateSettled;
+
+      logic.updateFeed([_drama('restored')], resetToFirst: true);
+      await logic.feedUpdateSettled;
+      await _drain(logic);
+
+      expect(logic.queue.entryAt(0).drama.id, 'restored');
+      expect(logic.session.currentIndex, 0);
+      expect(logic.currentDramaId, 'restored');
+      expect(factory.live, greaterThan(0));
+      logic.dispose();
+      await _drain(logic);
+    });
+
+    test('should_reset_to_first_when_channel_changes_with_same_ids',
+        () async {
+      final factory = _RecordingFactory();
+      final feed = [_drama('same-a'), _drama('same-b')];
+      final logic = _logic(FakeWatchHistory());
+      logic.attach(
+        PlayerPage(
+          drama: feed.first,
+          initialIndex: 1,
+          homeMode: true,
+          feedDramas: feed,
+        ),
+        isMounted: () => true,
+      );
+      logic.start(factory: factory.create, coordinator: PlaybackCoordinator());
+      await _drain(logic);
+      expect(logic.session.currentIndex, 1);
+
+      logic.updateFeed(feed, resetToFirst: true);
+      await logic.feedUpdateSettled;
+      await _drain(logic);
+
+      expect(logic.session.currentIndex, 0);
+      expect(logic.currentDramaId, 'same-a');
+      logic.dispose();
+      await _drain(logic);
+    });
   });
 
   group('lifecycle', () {