fix Ink not updating on TextField newline (#140700)

Fixes a layout bug when using an EditableText and something containing an Ink widget.

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

@@ -37,6 +37,7 @@ import 'scroll_position.dart';
 import 'scrollable.dart';
 import 'scrollable_helpers.dart';
 import 'shortcuts.dart';
+import 'size_changed_layout_notifier.dart';
 import 'spell_check.dart';
 import 'tap_region.dart';
 import 'text.dart';
@@ -4951,48 +4952,50 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
                             _openInputConnection();
                             _updateSelectionRects(force: true);
                           },
-                          child: _Editable(
-                            key: _editableKey,
-                            startHandleLayerLink: _startHandleLayerLink,
-                            endHandleLayerLink: _endHandleLayerLink,
-                            inlineSpan: buildTextSpan(),
-                            value: _value,
-                            cursorColor: _cursorColor,
-                            backgroundCursorColor: widget.backgroundCursorColor,
-                            showCursor: _cursorVisibilityNotifier,
-                            forceLine: widget.forceLine,
-                            readOnly: widget.readOnly,
-                            hasFocus: _hasFocus,
-                            maxLines: widget.maxLines,
-                            minLines: widget.minLines,
-                            expands: widget.expands,
-                            strutStyle: widget.strutStyle,
-                            selectionColor: _selectionOverlay?.spellCheckToolbarIsVisible ?? false
-                                ? _spellCheckConfiguration.misspelledSelectionColor ?? widget.selectionColor
-                                : widget.selectionColor,
-                            textScaler: effectiveTextScaler,
-                            textAlign: widget.textAlign,
-                            textDirection: _textDirection,
-                            locale: widget.locale,
-                            textHeightBehavior: widget.textHeightBehavior ?? DefaultTextHeightBehavior.maybeOf(context),
-                            textWidthBasis: widget.textWidthBasis,
-                            obscuringCharacter: widget.obscuringCharacter,
-                            obscureText: widget.obscureText,
-                            offset: offset,
-                            rendererIgnoresPointer: widget.rendererIgnoresPointer,
-                            cursorWidth: widget.cursorWidth,
-                            cursorHeight: widget.cursorHeight,
-                            cursorRadius: widget.cursorRadius,
-                            cursorOffset: widget.cursorOffset ?? Offset.zero,
-                            selectionHeightStyle: widget.selectionHeightStyle,
-                            selectionWidthStyle: widget.selectionWidthStyle,
-                            paintCursorAboveText: widget.paintCursorAboveText,
-                            enableInteractiveSelection: widget._userSelectionEnabled,
-                            textSelectionDelegate: this,
-                            devicePixelRatio: _devicePixelRatio,
-                            promptRectRange: _currentPromptRectRange,
-                            promptRectColor: widget.autocorrectionTextRectColor,
-                            clipBehavior: widget.clipBehavior,
+                          child: SizeChangedLayoutNotifier(
+                            child: _Editable(
+                              key: _editableKey,
+                              startHandleLayerLink: _startHandleLayerLink,
+                              endHandleLayerLink: _endHandleLayerLink,
+                              inlineSpan: buildTextSpan(),
+                              value: _value,
+                              cursorColor: _cursorColor,
+                              backgroundCursorColor: widget.backgroundCursorColor,
+                              showCursor: _cursorVisibilityNotifier,
+                              forceLine: widget.forceLine,
+                              readOnly: widget.readOnly,
+                              hasFocus: _hasFocus,
+                              maxLines: widget.maxLines,
+                              minLines: widget.minLines,
+                              expands: widget.expands,
+                              strutStyle: widget.strutStyle,
+                              selectionColor: _selectionOverlay?.spellCheckToolbarIsVisible ?? false
+                                  ? _spellCheckConfiguration.misspelledSelectionColor ?? widget.selectionColor
+                                  : widget.selectionColor,
+                              textScaler: effectiveTextScaler,
+                              textAlign: widget.textAlign,
+                              textDirection: _textDirection,
+                              locale: widget.locale,
+                              textHeightBehavior: widget.textHeightBehavior ?? DefaultTextHeightBehavior.maybeOf(context),
+                              textWidthBasis: widget.textWidthBasis,
+                              obscuringCharacter: widget.obscuringCharacter,
+                              obscureText: widget.obscureText,
+                              offset: offset,
+                              rendererIgnoresPointer: widget.rendererIgnoresPointer,
+                              cursorWidth: widget.cursorWidth,
+                              cursorHeight: widget.cursorHeight,
+                              cursorRadius: widget.cursorRadius,
+                              cursorOffset: widget.cursorOffset ?? Offset.zero,
+                              selectionHeightStyle: widget.selectionHeightStyle,
+                              selectionWidthStyle: widget.selectionWidthStyle,
+                              paintCursorAboveText: widget.paintCursorAboveText,
+                              enableInteractiveSelection: widget._userSelectionEnabled,
+                              textSelectionDelegate: this,
+                              devicePixelRatio: _devicePixelRatio,
+                              promptRectRange: _currentPromptRectRange,
+                              promptRectColor: widget.autocorrectionTextRectColor,
+                              clipBehavior: widget.clipBehavior,
+                            ),
                           ),
                         ),
                       ),

packages/flutter/test/widgets/editable_text_test.dart

@@ -16731,6 +16731,34 @@ void main() {
     final EditableTextState state = tester.state<EditableTextState>(find.byType(EditableText));
     expect(state.renderEditable.cursorColor, cursorColor.withOpacity(opacity));
   });
+
+  testWidgets('should notify on size change', (WidgetTester tester) async {
+    int notifyCount = 0;
+    await tester.pumpWidget(MaterialApp(
+      home: Scaffold(
+        body: NotificationListener<SizeChangedLayoutNotification>(
+          onNotification: (SizeChangedLayoutNotification notification) {
+            notifyCount += 1;
+            return false;
+          },
+          child: EditableText(
+            backgroundCursorColor: Colors.grey,
+            cursorColor: Colors.grey,
+            controller: controller,
+            focusNode: focusNode,
+            maxLines: 3,
+            minLines: 1,
+            style: textStyle,
+          ),
+        ),
+      ),
+    ));
+
+    expect(notifyCount, equals(0));
+    await tester.enterText(find.byType(EditableText), '\n');
+    await tester.pumpAndSettle();
+    expect(notifyCount, equals(1));
+  });
 }
 
 class UnsettableController extends TextEditingController {