Apr 26, 2024 · Apr 25, 2024 · Apr 25, 2024 · Apr 25, 2024
diff --git a/packages/flutter/lib/src/rendering/shifted_box.dart b/packages/flutter/lib/src/rendering/shifted_box.dart

  @override
  void paint(PaintingContext context, Offset offset) {
    // There's no point in drawing the child if we're empty, or there is no
    // child.
    if (child == null || size.isEmpty) {
    if (child == null) {
      return;
    }


    // Display the overflow indicator if clipBehavior is Clip.none.
    assert(() {
      if (size.isEmpty) {
        return true;
      }
      switch (clipBehavior) {
        case Clip.none:
          paintOverflowIndicator(context, offset, _overflowContainerRect, _overflowChildRect);
diff --git a/packages/flutter/test/rendering/box_test.dart b/packages/flutter/test/rendering/box_test.dart
      // At least 2 lines.
      expect(constrainedHeight, greaterThanOrEqualTo(2 * unconstrainedHeight));
    });

    test('paints even when its size is empty', () {
      // Regression test for https://github.com/flutter/flutter/issues/146840.
      final RenderParagraph child = RenderParagraph(
        const TextSpan(text: ''),
        textDirection: TextDirection.ltr,
      );
      final RenderConstraintsTransformBox box = RenderConstraintsTransformBox(
        alignment: Alignment.center,
        textDirection: TextDirection.ltr,
        constraintsTransform: (BoxConstraints constraints) => constraints.copyWith(maxWidth: double.infinity),
        child: child,
      );

      layout(box, constraints: BoxConstraints.tight(Size.zero), phase: EnginePhase.paint);
      expect(box, paints..paragraph());
    });
  });

  test ('getMinIntrinsicWidth error handling', () {
Original file line number	Diff line number	Diff line change
Expand Up		@@ -896,9 +896,7 @@ class RenderConstraintsTransformBox extends RenderAligningShiftedBox with DebugO

		@override
		void paint(PaintingContext context, Offset offset) {
		// There's no point in drawing the child if we're empty, or there is no
		// child.
		if (child == null \|\| size.isEmpty) {
		if (child == null) {
		return;
		}

Expand All		@@ -919,6 +917,9 @@ class RenderConstraintsTransformBox extends RenderAligningShiftedBox with DebugO

		// Display the overflow indicator if clipBehavior is Clip.none.
		assert(() {
		if (size.isEmpty) {
		return true;
		}
		switch (clipBehavior) {
		case Clip.none:
		paintOverflowIndicator(context, offset, _overflowContainerRect, _overflowChildRect);
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -503,6 +503,23 @@ void main() {
		// At least 2 lines.
		expect(constrainedHeight, greaterThanOrEqualTo(2 * unconstrainedHeight));
		});

		test('paints even when its size is empty', () {
		// Regression test for https://github.com/flutter/flutter/issues/146840.
		final RenderParagraph child = RenderParagraph(
		const TextSpan(text: ''),
		textDirection: TextDirection.ltr,
		);
		final RenderConstraintsTransformBox box = RenderConstraintsTransformBox(
		alignment: Alignment.center,
		textDirection: TextDirection.ltr,
		constraintsTransform: (BoxConstraints constraints) => constraints.copyWith(maxWidth: double.infinity),
		child: child,
		);

		layout(box, constraints: BoxConstraints.tight(Size.zero), phase: EnginePhase.paint);
		expect(box, paints..paragraph());
		});
		});

		test ('getMinIntrinsicWidth error handling', () {
Expand Down