Fix RenderFittedBox when child.size.isEmpty (#35487)

packages/flutter/lib/src/rendering/object.dart

@@ -3614,7 +3614,7 @@ class _SemanticsGeometry {
     assert(transform != null);
     if (rect == null)
       return null;
-    if (rect.isEmpty)
+    if (rect.isEmpty || transform.isZero())
       return Rect.zero;
     return MatrixUtils.inverseTransformRect(transform, rect);
   }

packages/flutter/lib/src/rendering/proxy_box.dart

@@ -2311,7 +2311,7 @@ class RenderFittedBox extends RenderProxyBox {
 
   @override
   bool hitTestChildren(BoxHitTestResult result, { Offset position }) {
-    if (size.isEmpty)
+    if (size.isEmpty || child?.size?.isEmpty == true)
       return false;
     _updatePaintData();
     return result.addWithPaintTransform(
@@ -2325,7 +2325,7 @@ class RenderFittedBox extends RenderProxyBox {
 
   @override
   void applyPaintTransform(RenderBox child, Matrix4 transform) {
-    if (size.isEmpty) {
+    if (size.isEmpty || child.size.isEmpty) {
       transform.setZero();
     } else {
       _updatePaintData();

packages/flutter/test/rendering/proxy_box_test.dart

@@ -15,6 +15,23 @@ import '../flutter_test_alternative.dart';
 import 'rendering_tester.dart';
 
 void main() {
+  test('RenderFittedBox handles applying paint transform and hit-testing with empty size', () {
+    final RenderFittedBox fittedBox = RenderFittedBox(
+      child: RenderCustomPaint(
+        preferredSize: Size.zero,
+        painter: TestCallbackPainter(onPaint: () {}),
+      ),
+    );
+
+    layout(fittedBox, phase: EnginePhase.flushSemantics);
+    final Matrix4 transform = Matrix4.identity();
+    fittedBox.applyPaintTransform(fittedBox.child, transform);
+    expect(transform, Matrix4.zero());
+
+    final BoxHitTestResult hitTestResult = BoxHitTestResult();
+    expect(fittedBox.hitTestChildren(hitTestResult), isFalse);
+  });
+
   test('RenderFittedBox does not paint with empty sizes', () {
     bool painted;
     RenderFittedBox makeFittedBox(Size size) {

packages/flutter/test/widgets/clip_test.dart

@@ -61,6 +61,25 @@ class _UpdateCountedClipPath extends ClipPath {
 }
 
 void main() {
+  testWidgets('ClipRect with a FittedBox child sized to zero works with semantics', (WidgetTester tester) async {
+    await tester.pumpWidget(Directionality(
+        textDirection: TextDirection.ltr,
+        child: ClipRect(
+          child: FittedBox(
+            child: SizedBox.fromSize(
+              size: Size.zero,
+              child: Semantics(
+                image: true,
+                label: 'Image',
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+    expect(find.byType(FittedBox), findsOneWidget);
+  });
+
   testWidgets('ClipRect updates clipBehavior in updateRenderObject', (WidgetTester tester) async {
     await tester.pumpWidget(const _UpdateCountedClipRect());