add check for DefaultTextHeightBehavior in EditableText + tests (#59913)

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

@@ -29,6 +29,7 @@ import 'media_query.dart';
 import 'scroll_controller.dart';
 import 'scroll_physics.dart';
 import 'scrollable.dart';
+import 'text.dart';
 import 'text_selection.dart';
 import 'ticker_provider.dart';
 
@@ -2253,7 +2254,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
                 textAlign: widget.textAlign,
                 textDirection: _textDirection,
                 locale: widget.locale,
-                textHeightBehavior: widget.textHeightBehavior,
+                textHeightBehavior: widget.textHeightBehavior ?? DefaultTextHeightBehavior.of(context),
                 textWidthBasis: widget.textWidthBasis,
                 obscuringCharacter: widget.obscuringCharacter,
                 obscureText: widget.obscureText,

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

@@ -203,8 +203,8 @@ class DefaultTextStyle extends InheritedTheme {
   }
 }
 
-/// The [TextHeightBehavior] that will apply to descendant [Text] widgets which
-/// have not explicitly set [Text.textHeightBehavior].
+/// The [TextHeightBehavior] that will apply to descendant [Text] and [EditableText]
+/// widgets which have not explicitly set [Text.textHeightBehavior].
 ///
 /// If there is a [DefaultTextStyle] with a non-null [DefaultTextStyle.textHeightBehavior]
 /// below this widget, the [DefaultTextStyle.textHeightBehavior] will be used

packages/flutter/test/widgets/editable_text_test.dart

@@ -129,6 +129,7 @@ void main() {
     expect(editableText.enableSuggestions, isTrue);
     expect(editableText.textAlign, TextAlign.start);
     expect(editableText.cursorWidth, 2.0);
+    expect(editableText.textHeightBehavior, isNull);
   });
 
   testWidgets('text keyboard is requested when maxLines is default', (WidgetTester tester) async {
@@ -5062,6 +5063,70 @@ void main() {
     ));
     expect(renderObject.clipBehavior, equals(Clip.antiAlias));
   });
+
+  testWidgets('EditableText inherits DefaultTextHeightBehavior', (WidgetTester tester) async {
+    const TextHeightBehavior customTextHeightBehavior = TextHeightBehavior(
+      applyHeightToLastDescent: true,
+      applyHeightToFirstAscent: false,
+    );
+    await tester.pumpWidget(MediaQuery(
+      data: const MediaQueryData(devicePixelRatio: 1.0),
+      child: Directionality(
+        textDirection: TextDirection.ltr,
+        child: FocusScope(
+          node: focusScopeNode,
+          autofocus: true,
+          child: DefaultTextHeightBehavior(
+            textHeightBehavior: customTextHeightBehavior,
+            child: EditableText(
+              backgroundCursorColor: Colors.grey,
+              controller: controller,
+              focusNode: focusNode,
+              style: textStyle,
+              cursorColor: cursorColor,
+            ),
+          ),
+        ),
+      ),
+    ));
+    final RenderEditable renderObject = tester.allRenderObjects.whereType<RenderEditable>().first;
+    expect(renderObject.textHeightBehavior, equals(customTextHeightBehavior));
+  });
+
+  testWidgets('EditableText defaultTextHeightBehavior is used over inherited widget', (WidgetTester tester) async {
+    const TextHeightBehavior inheritedTextHeightBehavior = TextHeightBehavior(
+      applyHeightToLastDescent: true,
+      applyHeightToFirstAscent: false,
+    );
+    const TextHeightBehavior customTextHeightBehavior = TextHeightBehavior(
+      applyHeightToLastDescent: false,
+      applyHeightToFirstAscent: false,
+    );
+    await tester.pumpWidget(MediaQuery(
+      data: const MediaQueryData(devicePixelRatio: 1.0),
+      child: Directionality(
+        textDirection: TextDirection.ltr,
+        child: FocusScope(
+          node: focusScopeNode,
+          autofocus: true,
+          child: DefaultTextHeightBehavior(
+            textHeightBehavior: inheritedTextHeightBehavior,
+            child: EditableText(
+              backgroundCursorColor: Colors.grey,
+              controller: controller,
+              focusNode: focusNode,
+              style: textStyle,
+              cursorColor: cursorColor,
+              textHeightBehavior: customTextHeightBehavior,
+            ),
+          ),
+        ),
+      ),
+    ));
+    final RenderEditable renderObject = tester.allRenderObjects.whereType<RenderEditable>().first;
+    expect(renderObject.textHeightBehavior, isNot(equals(inheritedTextHeightBehavior)));
+    expect(renderObject.textHeightBehavior, equals(customTextHeightBehavior));
+  });
 }
 
 class MockTextFormatter extends TextInputFormatter {