Reland leak fix for EditableTextState (#133806)

Relands: https://github.com/flutter/flutter/pull/131377
Reverted in: https://github.com/flutter/flutter/pull/133804

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

@@ -2125,6 +2125,7 @@ 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.
@@ -2802,6 +2803,8 @@ 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;
@@ -2956,6 +2959,7 @@ 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');
@@ -4857,7 +4861,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
                             cursorColor: _cursorColor,
                             backgroundCursorColor: widget.backgroundCursorColor,
                             showCursor: EditableText.debugDeterministicCursor
-                                ? ValueNotifier<bool>(widget.showCursor)
+                                ? _debugCursorNotifier
                                 : _cursorVisibilityNotifier,
                             forceLine: widget.forceLine,
                             readOnly: widget.readOnly,

packages/flutter/test/material/text_selection_theme_test.dart

@@ -105,20 +105,7 @@ void main() {
     await tester.pumpAndSettle();
     final RenderBox handle = tester.firstRenderObject<RenderBox>(find.byType(CustomPaint));
     expect(handle, paints..path(color: defaultSelectionHandleColor));
-  },
-    // TODO(polina-c): remove after fixing
-    // https://github.com/flutter/flutter/issues/130469
-    leakTrackingTestConfig: const LeakTrackingTestConfig(
-      notDisposedAllowList: <String, int?>{
-        'ValueNotifier<MagnifierInfo>': 1,
-        'ValueNotifier<_OverlayEntryWidgetState?>': 2,
-        'ValueNotifier<bool>': 2,
-        '_InputBorderGap': 1,
-      },
-      // TODO(polina-c): investigate notGCed, if it does not disappear after fixing notDisposed.
-      allowAllNotGCed: true,
-    ),
-  );
+  });
 
   testWidgetsWithLeakTracking('Material3 - Empty textSelectionTheme will use defaults', (WidgetTester tester) async {
     final ThemeData theme = ThemeData(useMaterial3: true);
@@ -167,18 +154,7 @@ void main() {
     await tester.pumpAndSettle();
     final RenderBox handle = tester.firstRenderObject<RenderBox>(find.byType(CustomPaint));
     expect(handle, paints..path(color: defaultSelectionHandleColor));
-  },
-    // TODO(polina-c): remove after fixing
-    // https://github.com/flutter/flutter/issues/130469
-    leakTrackingTestConfig: const LeakTrackingTestConfig(
-      notDisposedAllowList: <String, int?>{
-        'ValueNotifier<MagnifierInfo>': 1,
-        'ValueNotifier<_OverlayEntryWidgetState?>': 2,
-        'ValueNotifier<bool>': 2,
-        '_InputBorderGap': 1,
-      },
-    ),
-  );
+  });
 
   testWidgets('ThemeData.textSelectionTheme will be used if provided', (WidgetTester tester) async {
     const TextSelectionThemeData textSelectionTheme = TextSelectionThemeData(