fix: prevent page flickering on rapid sidebar clicks (#8278)

* fix: prevent page flickering on rapid sidebar clicks

* refactor: improve deduplication to check both plugin and view IDs

Author: RishiAhuja

frontend/appflowy_flutter/lib/workspace/application/tabs/tabs_bloc.dart

@@ -28,6 +28,11 @@ class TabsBloc extends Bloc<TabsEvent, TabsState> {
 
   late final MenuSharedState menuSharedState;
 
+  String? _lastOpenedPluginId;
+  String? _lastOpenedViewId;
+  DateTime? _lastOpenTime;
+  static const _deduplicationWindow = Duration(milliseconds: 500);
+
   @override
   Future<void> close() {
     state.dispose();
@@ -73,6 +78,22 @@ class TabsBloc extends Bloc<TabsEvent, TabsState> {
             _setLatestOpenView(view);
           },
           openPlugin: (Plugin plugin, ViewPB? view, bool setLatest) {
+            final now = DateTime.now();
+
+            // deduplicate. skip if same plugin and view were just opened
+            if (_lastOpenedPluginId == plugin.id &&
+                _lastOpenedViewId == view?.id &&
+                _lastOpenTime != null) {
+              final timeSinceLastOpen = now.difference(_lastOpenTime!);
+              if (timeSinceLastOpen < _deduplicationWindow) {
+                return;
+              }
+            }
+
+            _lastOpenedPluginId = plugin.id;
+            _lastOpenedViewId = view?.id;
+            _lastOpenTime = now;
+
             state.currentPageManager
               ..hideSecondaryPlugin()
               ..setSecondaryPlugin(BlankPagePlugin());

frontend/appflowy_flutter/lib/workspace/presentation/home/menu/view/view_item.dart

@@ -497,6 +497,23 @@ class _SingleInnerViewItemState extends State<SingleInnerViewItem> {
 
   bool isIconPickerOpened = false;
 
+  DateTime? _lastClickTime;
+  static const _clickThrottleDuration = Duration(milliseconds: 200);
+
+  void _handleViewTap() {
+    final now = DateTime.now();
+
+    if (_lastClickTime != null) {
+      final timeSinceLastClick = now.difference(_lastClickTime!);
+      if (timeSinceLastClick < _clickThrottleDuration) {
+        return;
+      }
+    }
+
+    _lastClickTime = now;
+    widget.onSelected(context, widget.view);
+  }
+
   @override
   Widget build(BuildContext context) {
     bool isSelected = widget.isSelected;
@@ -586,7 +603,7 @@ class _SingleInnerViewItemState extends State<SingleInnerViewItem> {
 
     final child = GestureDetector(
       behavior: HitTestBehavior.translucent,
-      onTap: () => widget.onSelected(context, widget.view),
+      onTap: _handleViewTap,
       onTertiaryTapDown: (_) =>
           widget.onTertiarySelected?.call(context, widget.view),
       child: SizedBox(