Reland "Fix position of CupertinoContextMenu within Transform.scale" (flutter#102943)

* Fix position of CupertinoContextMenu within Transform.scale (flutter#97896)

* Fix after rebase

Author: moffatman

packages/flutter/lib/src/cupertino/context_menu.dart

@@ -47,10 +47,11 @@ typedef _ContextMenuPreviewBuilderChildless = Widget Function(
 Rect _getRect(GlobalKey globalKey) {
   assert(globalKey.currentContext != null);
   final RenderBox renderBoxContainer = globalKey.currentContext!.findRenderObject()! as RenderBox;
-  final Offset containerOffset = renderBoxContainer.localToGlobal(
+  return Rect.fromPoints(renderBoxContainer.localToGlobal(
     renderBoxContainer.paintBounds.topLeft,
-  );
-  return containerOffset & renderBoxContainer.paintBounds.size;
+  ), renderBoxContainer.localToGlobal(
+    renderBoxContainer.paintBounds.bottomRight
+  ));
 }
 
 // The context menu arranges itself slightly differently based on the location

packages/flutter/test/cupertino/context_menu_test.dart

@@ -228,6 +228,62 @@ void main() {
         kIsWeb ? SystemMouseCursors.click : SystemMouseCursors.basic,
       );
     });
+
+    testWidgets('CupertinoContextMenu is in the correct position when within a Transform.scale', (WidgetTester tester) async {
+      final Widget child = getChild();
+      await tester.pumpWidget(CupertinoApp(
+        home: CupertinoPageScaffold(
+          child: MediaQuery(
+            data: const MediaQueryData(size: Size(800, 600)),
+            child: Transform.scale(
+              scale: 0.5,
+              child: Align(
+                //alignment: Alignment.bottomRight,
+                child: CupertinoContextMenu(
+                  actions: const <CupertinoContextMenuAction>[
+                    CupertinoContextMenuAction(
+                      child: Text('CupertinoContextMenuAction'),
+                    ),
+                  ],
+                  child: child
+                ),
+              )
+            )
+          )
+        )
+      ));
+      expect(find.byWidget(child), findsOneWidget);
+      final Rect childRect = tester.getRect(find.byWidget(child));
+      expect(find.byType(ShaderMask), findsNothing);
+
+      // Start a press on the child.
+      final TestGesture gesture = await tester.startGesture(childRect.center);
+      await tester.pump();
+
+      // The _DecoyChild is showing directly on top of the child.
+      expect(findDecoyChild(child), findsOneWidget);
+      Rect decoyChildRect = tester.getRect(findDecoyChild(child));
+      expect(childRect, equals(decoyChildRect));
+
+      expect(find.byType(ShaderMask), findsOneWidget);
+
+      // After a small delay, the _DecoyChild has begun to animate.
+      await tester.pump(const Duration(milliseconds: 100));
+      decoyChildRect = tester.getRect(findDecoyChild(child));
+      expect(childRect, isNot(equals(decoyChildRect)));
+
+      // Eventually the decoy fully scales by _kOpenSize.
+      await tester.pump(const Duration(milliseconds: 500));
+      decoyChildRect = tester.getRect(findDecoyChild(child));
+      expect(childRect, isNot(equals(decoyChildRect)));
+      expect(decoyChildRect.width, childRect.width * kOpenScale);
+
+      // Then the CupertinoContextMenu opens.
+      await tester.pumpAndSettle();
+      await gesture.up();
+      await tester.pumpAndSettle();
+      expect(findStatic(), findsOneWidget);
+    });
   });
 
   group('CupertinoContextMenu when open', () {

packages/flutter/test/material/flexible_space_bar_test.dart

@@ -473,8 +473,8 @@ void main() {
       Rect.fromLTRB(
         0,
         height - titleFontSize - 10,
-        (width / 1.5).floorToDouble(),
-        height - 10,
+        (width / 1.5).floorToDouble() * 1.5,
+        height,
       ),
     );
   });
@@ -545,8 +545,8 @@ void main() {
       Rect.fromLTRB(
         0,
         height - titleFontSize - bottomMargin,
-        (collapsedWidth / 3).floorToDouble(),
-        height - bottomMargin,
+        (collapsedWidth / 3).floorToDouble() * 3,
+        height,
       ),
     );
   });

packages/flutter/test/material/input_decorator_test.dart

@@ -4321,17 +4321,17 @@ void main() {
     await pumpDecorator(focused: false, empty: false);
     await tester.pumpAndSettle();
     expect(getLabelRect(tester).topLeft, equals(const Offset(12, -5.5)));
-    expect(getLabelRect(tester).size, equals(const Size(80, 16)));
+    expect(getLabelRect(tester).size, equals(const Size(80, 16) * 0.75));
 
     await pumpDecorator(focused: true);
     await tester.pumpAndSettle();
     expect(getLabelRect(tester).topLeft, equals(const Offset(12, -5.5)));
-    expect(getLabelRect(tester).size, equals(const Size(80, 16)));
+    expect(getLabelRect(tester).size, equals(const Size(80, 16) * 0.75));
 
     await pumpDecorator(focused: true, empty: false);
     await tester.pumpAndSettle();
     expect(getLabelRect(tester).topLeft, equals(const Offset(12, -5.5)));
-    expect(getLabelRect(tester).size, equals(const Size(80, 16)));
+    expect(getLabelRect(tester).size, equals(const Size(80, 16) * 0.75));
 
     await pumpDecorator(focused: false, enabled: false);
     await tester.pumpAndSettle();
@@ -4341,7 +4341,7 @@ void main() {
     await pumpDecorator(focused: false, empty: false, enabled: false);
     await tester.pumpAndSettle();
     expect(getLabelRect(tester).topLeft, equals(const Offset(12, -5.5)));
-    expect(getLabelRect(tester).size, equals(const Size(80, 16)));
+    expect(getLabelRect(tester).size, equals(const Size(80, 16) * 0.75));
 
     // Focused and disabled happens with NavigationMode.directional.
     await pumpDecorator(focused: true, enabled: false);
@@ -4352,7 +4352,7 @@ void main() {
     await pumpDecorator(focused: true, empty: false, enabled: false);
     await tester.pumpAndSettle();
     expect(getLabelRect(tester).topLeft, equals(const Offset(12, -5.5)));
-    expect(getLabelRect(tester).size, equals(const Size(80, 16)));
+    expect(getLabelRect(tester).size, equals(const Size(80, 16) * 0.75));
   });
 
   testWidgets('InputDecorationTheme.toString()', (WidgetTester tester) async {

packages/flutter_test/lib/src/controller.dart

@@ -1138,7 +1138,7 @@ abstract class WidgetController {
 
   /// Returns the rect of the given widget. This is only valid once
   /// the widget's render object has been laid out at least once.
-  Rect getRect(Finder finder) => getTopLeft(finder) & getSize(finder);
+  Rect getRect(Finder finder) => Rect.fromPoints(getTopLeft(finder), getBottomRight(finder));
 
   /// Attempts to find the [SemanticsNode] of first result from `finder`.
   ///