Fixed mouse cursor of disabled IconButton (#84946)

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

@@ -153,7 +153,7 @@ class IconButton extends StatelessWidget {
     this.splashColor,
     this.disabledColor,
     required this.onPressed,
-    this.mouseCursor = SystemMouseCursors.click,
+    this.mouseCursor,
     this.focusNode,
     this.autofocus = false,
     this.tooltip,
@@ -280,8 +280,10 @@ class IconButton extends StatelessWidget {
 
   /// {@macro flutter.material.RawMaterialButton.mouseCursor}
   ///
-  /// Defaults to [SystemMouseCursors.click].
-  final MouseCursor mouseCursor;
+  /// If set to null, will default to
+  /// - [SystemMouseCursors.forbidden], if [onPressed] is null
+  /// - [SystemMouseCursors.click], otherwise
+  final MouseCursor? mouseCursor;
 
   /// {@macro flutter.widgets.Focus.focusNode}
   final FocusNode? focusNode;
@@ -379,7 +381,7 @@ class IconButton extends StatelessWidget {
         autofocus: autofocus,
         canRequestFocus: onPressed != null,
         onTap: onPressed,
-        mouseCursor: mouseCursor,
+        mouseCursor: mouseCursor ?? (onPressed == null ? SystemMouseCursors.forbidden : SystemMouseCursors.click),
         enableFeedback: enableFeedback,
         focusColor: focusColor ?? theme.focusColor,
         hoverColor: hoverColor ?? theme.hoverColor,

packages/flutter/test/material/icon_button_test.dart

@@ -680,6 +680,72 @@ void main() {
 
     expect(RendererBinding.instance!.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.click);
   });
+
+  testWidgets('disabled IconButton has forbidden mouse cursor', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const Material(
+        child: Directionality(
+          textDirection: TextDirection.ltr,
+          child: Center(
+            child: IconButton(
+              onPressed: null, // null value indicates IconButton is disabled
+              icon: Icon(Icons.play_arrow),
+            ),
+          ),
+        ),
+      ),
+    );
+
+    final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse, pointer: 1);
+    await gesture.addPointer(location: tester.getCenter(find.byType(IconButton)));
+    addTearDown(gesture.removePointer);
+
+    await tester.pump();
+
+    expect(RendererBinding.instance!.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.forbidden);
+  });
+
+  testWidgets('IconButton.mouseCursor overrides implicit setting of mouse cursor', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const Material(
+        child: Directionality(
+          textDirection: TextDirection.ltr,
+          child: Center(
+            child: IconButton(
+              onPressed: null,
+              mouseCursor: SystemMouseCursors.none,
+              icon: Icon(Icons.play_arrow),
+            ),
+          ),
+        ),
+      ),
+    );
+
+    final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse, pointer: 1);
+    await gesture.addPointer(location: tester.getCenter(find.byType(IconButton)));
+    addTearDown(gesture.removePointer);
+
+    await tester.pump();
+
+    expect(RendererBinding.instance!.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.none);
+
+    await tester.pumpWidget(
+      Material(
+        child: Directionality(
+          textDirection: TextDirection.ltr,
+          child: Center(
+            child: IconButton(
+              onPressed: () {},
+              mouseCursor: SystemMouseCursors.none,
+              icon: const Icon(Icons.play_arrow),
+            ),
+          ),
+        ),
+      ),
+    );
+
+    expect(RendererBinding.instance!.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.none);
+  });
 }
 
 Widget wrap({ required Widget child }) {