Reland "Add BuildContext parameter to TextEditingController.buildTextSpan" (#73510)

packages/flutter/lib/src/material/selectable_text.dart

@@ -32,7 +32,7 @@ class _TextSpanEditingController extends TextEditingController {
   final TextSpan _textSpan;
 
   @override
-  TextSpan buildTextSpan({TextStyle? style ,bool? withComposing}) {
+  TextSpan buildTextSpan({required BuildContext context, TextStyle? style, required bool withComposing}) {
     // This does not care about composing.
     return TextSpan(
       style: style,

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

@@ -198,7 +198,7 @@ class TextEditingController extends ValueNotifier<TextEditingValue> {
   ///
   /// By default makes text in composing range appear as underlined. Descendants
   /// can override this method to customize appearance of text.
-  TextSpan buildTextSpan({TextStyle? style , required bool withComposing}) {
+  TextSpan buildTextSpan({required BuildContext context, TextStyle? style , required bool withComposing}) {
     assert(!value.composing.isValid || !withComposing || value.isComposingRangeValid);
     // If the composing range is out of range for the current text, ignore it to
     // preserve the tree integrity, otherwise in release mode a RangeError will
@@ -2680,6 +2680,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
     }
     // Read only mode should not paint text composing.
     return widget.controller.buildTextSpan(
+      context: context,
       style: widget.style,
       withComposing: !widget.readOnly,
     );

packages/flutter/test/widgets/editable_text_test.dart

@@ -5810,6 +5810,25 @@ void main() {
         }),
       );
     });
+
+    testWidgets('TextEditingController.buildTextSpan receives build context', (WidgetTester tester) async {
+      final _AccentColorTextEditingController controller = _AccentColorTextEditingController('a');
+      const Color color = Color.fromARGB(255, 1, 2, 3);
+      await tester.pumpWidget(MaterialApp(
+        theme: ThemeData.light().copyWith(accentColor: color),
+        home: EditableText(
+          controller: controller,
+          focusNode: FocusNode(),
+          style: Typography.material2018(platform: TargetPlatform.android).black.subtitle1!,
+          cursorColor: Colors.blue,
+          backgroundCursorColor: Colors.grey,
+        ),
+      ));
+
+      final RenderEditable renderEditable = findRenderEditable(tester);
+      final TextSpan textSpan = renderEditable.text!;
+      expect(textSpan.style!.color, color);
+    });
   });
 
   testWidgets('autofocus:true on first frame does not throw', (WidgetTester tester) async {
@@ -7286,3 +7305,13 @@ class SkipPaintingRenderObject extends RenderProxyBox {
   @override
   void paint(PaintingContext context, Offset offset) { }
 }
+
+class _AccentColorTextEditingController extends TextEditingController {
+  _AccentColorTextEditingController(String text) : super(text: text);
+
+  @override
+  TextSpan buildTextSpan({required BuildContext context, TextStyle? style, required bool withComposing}) {
+    final Color color = Theme.of(context).accentColor;
+    return super.buildTextSpan(context: context, style: TextStyle(color: color), withComposing: withComposing);
+  }
+}