fix: editing cell height when editing row contains multi text cell

frontend/app_flowy/lib/plugins/board/presentation/card/board_cell.dart

@@ -14,33 +14,37 @@ class EditableCellNotifier {
 }
 
 class EditableRowNotifier {
-  Map<EditableCellId, EditableCellNotifier> cells = {};
+  final Map<EditableCellId, EditableCellNotifier> _cells = {};
 
   void insertCell(
     GridCellIdentifier cellIdentifier,
     EditableCellNotifier notifier,
   ) {
-    cells[EditableCellId.from(cellIdentifier)] = notifier;
+    _cells[EditableCellId.from(cellIdentifier)] = notifier;
   }
 
   void becomeFirstResponder() {
-    for (final notifier in cells.values) {
+    for (final notifier in _cells.values) {
       notifier.becomeFirstResponder.notify();
     }
   }
 
   void resignFirstResponder() {
-    for (final notifier in cells.values) {
+    for (final notifier in _cells.values) {
       notifier.resignFirstResponder.notify();
     }
   }
 
+  void clear() {
+    _cells.clear();
+  }
+
   void dispose() {
-    for (final notifier in cells.values) {
+    for (final notifier in _cells.values) {
       notifier.resignFirstResponder.notify();
     }
 
-    cells.clear();
+    _cells.clear();
   }
 }
 

frontend/app_flowy/lib/plugins/board/presentation/card/card.dart

@@ -89,20 +89,20 @@ class _BoardCardState extends State<BoardCard> {
     List<GridCellIdentifier> cells,
   ) {
     final List<Widget> children = [];
+    rowNotifier.clear();
     cells.asMap().forEach(
       (int index, GridCellIdentifier cellId) {
         final cellNotifier = EditableCellNotifier();
         Widget child = widget.cellBuilder.buildCell(
           widget.groupId,
           cellId,
-          widget.isEditing,
+          index == 0 ? widget.isEditing : false,
           cellNotifier,
         );
 
         if (index == 0) {
           rowNotifier.insertCell(cellId, cellNotifier);
         }
-
         child = Padding(
           key: cellId.key(),
           padding: const EdgeInsets.only(left: 4, right: 4),