EditableTextState should dispose cursorVisibilityNotifier. (#133858)

packages/flutter/lib/src/widgets/editable_text.dart

@@ -2125,7 +2125,6 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
   late final Simulation _iosBlinkCursorSimulation = _DiscreteKeyFrameSimulation.iOSBlinkingCaret();
 
   final ValueNotifier<bool> _cursorVisibilityNotifier = ValueNotifier<bool>(true);
-  final ValueNotifier<bool> _debugCursorNotifier = ValueNotifier<bool>(true);
   final GlobalKey _editableKey = GlobalKey();
 
   /// Detects whether the clipboard can paste.
@@ -2803,8 +2802,6 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
   void didChangeDependencies() {
     super.didChangeDependencies();
 
-    _debugCursorNotifier.value = widget.showCursor;
-
     _style = MediaQuery.boldTextOf(context)
         ? widget.style.merge(const TextStyle(fontWeight: FontWeight.bold))
         : widget.style;
@@ -2959,7 +2956,6 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
     clipboardStatus.removeListener(_onChangedClipboardStatus);
     clipboardStatus.dispose();
     _cursorVisibilityNotifier.dispose();
-    _debugCursorNotifier.dispose();
     FocusManager.instance.removeListener(_unflagInternalFocus);
     super.dispose();
     assert(_batchEditDepth <= 0, 'unfinished batch edits: $_batchEditDepth');
@@ -3879,7 +3875,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
   void _onCursorColorTick() {
     final double effectiveOpacity = math.min(widget.cursorColor.alpha / 255.0, _cursorBlinkOpacityController.value);
     renderEditable.cursorColor = widget.cursorColor.withOpacity(effectiveOpacity);
-    _cursorVisibilityNotifier.value = widget.showCursor && _cursorBlinkOpacityController.value > 0;
+    _cursorVisibilityNotifier.value = widget.showCursor && (EditableText.debugDeterministicCursor || _cursorBlinkOpacityController.value > 0);
   }
 
   bool get _showBlinkingCursor => _hasFocus && _value.selection.isCollapsed && widget.showCursor && _tickersEnabled;
@@ -4860,9 +4856,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
                             value: _value,
                             cursorColor: _cursorColor,
                             backgroundCursorColor: widget.backgroundCursorColor,
-                            showCursor: EditableText.debugDeterministicCursor
-                                ? _debugCursorNotifier
-                                : _cursorVisibilityNotifier,
+                            showCursor: _cursorVisibilityNotifier,
                             forceLine: widget.forceLine,
                             readOnly: widget.readOnly,
                             hasFocus: _hasFocus,