refactor: GridCellRequestFocusNotifier only accepts single listener

frontend/app_flowy/lib/workspace/presentation/plugins/grid/src/widgets/cell/cell_builder.dart

@@ -57,6 +57,24 @@ abstract class GridCellWidget extends HoverWidget {
 }
 
 class GridCellRequestFocusNotifier extends ChangeNotifier {
+  VoidCallback? _listener;
+
+  @override
+  void addListener(VoidCallback listener) {
+    if (_listener != null) {
+      removeListener(_listener!);
+    }
+
+    _listener = listener;
+    super.addListener(listener);
+  }
+
+  void removeAllListener() {
+    if (_listener != null) {
+      removeListener(_listener!);
+    }
+  }
+
   void notify() {
     notifyListeners();
   }

frontend/app_flowy/lib/workspace/presentation/plugins/grid/src/widgets/cell/checkbox_cell.dart

@@ -57,6 +57,7 @@ class _CheckboxCellState extends State<CheckboxCell> {
 
   @override
   Future<void> dispose() async {
+    widget.requestFocus.removeAllListener();
     _cellBloc.close();
     super.dispose();
   }

frontend/app_flowy/lib/workspace/presentation/plugins/grid/src/widgets/cell/number_cell.dart

@@ -23,7 +23,6 @@ class _NumberCellState extends State<NumberCell> {
   late NumberCellBloc _cellBloc;
   late TextEditingController _controller;
   late FocusNode _focusNode;
-  VoidCallback? _focusListener;
   Timer? _delayOperation;
 
   @override
@@ -70,9 +69,7 @@ class _NumberCellState extends State<NumberCell> {
 
   @override
   Future<void> dispose() async {
-    if (_focusListener != null) {
-      widget.requestFocus.removeListener(_focusListener!);
-    }
+    widget.requestFocus.removeAllListener();
     _delayOperation?.cancel();
     _cellBloc.close();
     _focusNode.dispose();
@@ -96,17 +93,10 @@ class _NumberCellState extends State<NumberCell> {
   }
 
   void _listenCellRequestFocus(BuildContext context) {
-    if (_focusListener != null) {
-      widget.requestFocus.removeListener(_focusListener!);
-    }
-
-    focusListener() {
+    widget.requestFocus.addListener(() {
       if (_focusNode.hasFocus == false && _focusNode.canRequestFocus) {
         FocusScope.of(context).requestFocus(_focusNode);
       }
-    }
-
-    _focusListener = focusListener;
-    widget.requestFocus.addListener(focusListener);
+    });
   }
 }

frontend/app_flowy/lib/workspace/presentation/plugins/grid/src/widgets/cell/selection_cell/selection_cell.dart

@@ -157,7 +157,6 @@ class _SelectOptionCell extends StatelessWidget {
       );
     }
 
-    final cellContext = cellContextBuilder.build() as GridSelectOptionCellContext;
     return Stack(
       alignment: AlignmentDirectional.center,
       fit: StackFit.expand,
@@ -166,6 +165,7 @@ class _SelectOptionCell extends StatelessWidget {
         InkWell(
           onTap: () {
             onFocus(true);
+            final cellContext = cellContextBuilder.build() as GridSelectOptionCellContext;
             SelectOptionCellEditor.show(context, cellContext, () => onFocus(false));
           },
         ),

frontend/app_flowy/lib/workspace/presentation/plugins/grid/src/widgets/cell/text_cell.dart

@@ -36,7 +36,8 @@ class _GridTextCellState extends State<GridTextCell> {
   late TextCellBloc _cellBloc;
   late TextEditingController _controller;
   late FocusNode _focusNode;
-  VoidCallback? _focusListener;
+
+  VoidCallback? _focusNodeListener;
   Timer? _delayOperation;
 
   @override
@@ -87,32 +88,29 @@ class _GridTextCellState extends State<GridTextCell> {
     );
   }
 
-  void _listenCellRequestFocus(BuildContext context) {
-    if (_focusListener != null) {
-      widget.requestFocus.removeListener(_focusListener!);
-    }
-
-    focusListener() {
-      if (_focusNode.hasFocus == false && _focusNode.canRequestFocus) {
-        FocusScope.of(context).requestFocus(_focusNode);
-      }
-    }
-
-    _focusListener = focusListener;
-    widget.requestFocus.addListener(focusListener);
-  }
-
   @override
   Future<void> dispose() async {
-    if (_focusListener != null) {
-      widget.requestFocus.removeListener(_focusListener!);
-    }
+    widget.requestFocus.removeAllListener();
     _delayOperation?.cancel();
     _cellBloc.close();
     _focusNode.dispose();
     super.dispose();
   }
 
+  @override
+  void didUpdateWidget(covariant GridTextCell oldWidget) {
+    // TODO: implement didUpdateWidget
+    super.didUpdateWidget(oldWidget);
+  }
+
+  void _listenCellRequestFocus(BuildContext context) {
+    widget.requestFocus.addListener(() {
+      if (_focusNode.hasFocus == false && _focusNode.canRequestFocus) {
+        FocusScope.of(context).requestFocus(_focusNode);
+      }
+    });
+  }
+
   Future<void> focusChanged() async {
     if (mounted) {
       _delayOperation?.cancel();

frontend/app_flowy/lib/workspace/presentation/plugins/grid/src/widgets/row/grid_row.dart

@@ -153,7 +153,7 @@ class _RowCells extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return BlocBuilder<RowBloc, RowState>(
-      buildWhen: (previous, current) => previous.cellDataMap.length != current.cellDataMap.length,
+      buildWhen: (previous, current) => previous.cellDataMap != current.cellDataMap,
       builder: (context, state) {
         return IntrinsicHeight(
             child: Row(