Add 'mouseCursor' to TextFormField (#99822)

* Add 'mouseCursor' to TextFormField

Added 'mouseCursor' to TextFormField. 
Related issue: https://github.com/flutter/flutter/issues/99770

* added test for 'mouseCursor' in TextFormField.

added test for 'mouseCursor' in TextFormField.

* Update packages/flutter/test/material/text_form_field_test.dart
Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

* Update packages/flutter/test/material/text_form_field_test.dart
Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

* Minor update: Added a space.

* Removed icon & minor updates.
Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

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

@@ -146,6 +146,7 @@ class TextFormField extends FormField<String> {
     ScrollController? scrollController,
     String? restorationId,
     bool enableIMEPersonalizedLearning = true,
+    MouseCursor? mouseCursor,
   }) : assert(initialValue == null || controller == null),
        assert(textAlign != null),
        assert(autofocus != null),
@@ -236,6 +237,7 @@ class TextFormField extends FormField<String> {
                autofillHints: autofillHints,
                scrollController: scrollController,
                enableIMEPersonalizedLearning: enableIMEPersonalizedLearning,
+               mouseCursor: mouseCursor,
              ),
            );
          },

packages/flutter/test/material/text_form_field_test.dart

@@ -817,4 +817,69 @@ void main() {
     final TextField textFieldWidget = tester.widget(textFieldFinder);
     expect(textFieldWidget.scrollController, scrollController);
   });
+
+  testWidgets('TextFormField changes mouse cursor when hovered', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: MouseRegion(
+            cursor: SystemMouseCursors.forbidden,
+            child: TextFormField(
+              mouseCursor: SystemMouseCursors.grab,
+            ),
+          ),
+        ),
+      ),
+    );
+
+    // Center, which is within the area
+    final Offset center = tester.getCenter(find.byType(TextFormField));
+    // Top left, which is also within the area
+    final Offset edge = tester.getTopLeft(find.byType(TextFormField)) + const Offset(1, 1);
+
+    final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse, pointer: 1);
+    await gesture.addPointer(location: center);
+    addTearDown(gesture.removePointer);
+
+    await tester.pump();
+
+    expect(RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.grab);
+
+    // Test default cursor
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: MouseRegion(
+            cursor: SystemMouseCursors.forbidden,
+            child: TextFormField(),
+          ),
+        ),
+      ),
+    );
+
+    expect(RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.text);
+    await gesture.moveTo(edge);
+    expect(RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.text);
+    await gesture.moveTo(center);
+
+    // Test default cursor when disabled
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: MouseRegion(
+            cursor: SystemMouseCursors.forbidden,
+            child: TextFormField(
+              enabled: false,
+            ),
+          ),
+        ),
+      ),
+    );
+
+    expect(RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.basic);
+    await gesture.moveTo(edge);
+    expect(RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1), SystemMouseCursors.basic);
+    await gesture.moveTo(center);
+  });
+
 }