fix: The cursor will not disappear after clicking in an area outside the editor.

frontend/app_flowy/packages/appflowy_editor/lib/src/service/keyboard_service.dart

@@ -129,6 +129,10 @@ class _AppFlowyKeyboardState extends State<AppFlowyKeyboard>
 
   void _onFocusChange(bool value) {
     Log.keyboard.debug('on keyboard event focus change $value');
+    isFocus = value;
+    if (!value) {
+      widget.editorState.service.selectionService.clearCursor();
+    }
   }
 
   KeyEventResult _onKey(FocusNode node, RawKeyEvent event) {

frontend/app_flowy/packages/appflowy_editor/lib/src/service/selection_service.dart

@@ -57,6 +57,9 @@ abstract class AppFlowySelectionService {
   /// Clears the selection area, cursor area and the popup list area.
   void clearSelection();
 
+  /// Clears the cursor area.
+  void clearCursor();
+
   /// Returns the [Node]s in [Selection].
   List<Node> getNodesInSelection(Selection selection);
 
@@ -205,16 +208,23 @@ class _AppFlowySelectionState extends State<AppFlowySelection>
     currentSelectedNodes = [];
     currentSelection.value = null;
 
+    clearCursor();
     // clear selection areas
     _selectionAreas
       ..forEach((overlay) => overlay.remove())
       ..clear();
     // clear cursor areas
+
+    // hide toolbar
+    editorState.service.toolbarService?.hide();
+  }
+
+  @override
+  void clearCursor() {
+    // clear cursor areas
     _cursorAreas
       ..forEach((overlay) => overlay.remove())
       ..clear();
-    // hide toolbar
-    editorState.service.toolbarService?.hide();
   }
 
   @override