Passes scrollPhysics (#48342)

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

@@ -124,6 +124,7 @@ class TextFormField extends FormField<String> {
     EdgeInsets scrollPadding = const EdgeInsets.all(20.0),
     bool enableInteractiveSelection = true,
     InputCounterWidgetBuilder buildCounter,
+    ScrollPhysics scrollPhysics,
   }) : assert(initialValue == null || controller == null),
        assert(textAlign != null),
        assert(autofocus != null),
@@ -201,6 +202,7 @@ class TextFormField extends FormField<String> {
         cursorRadius: cursorRadius,
         cursorColor: cursorColor,
         scrollPadding: scrollPadding,
+        scrollPhysics: scrollPhysics,
         keyboardAppearance: keyboardAppearance,
         enableInteractiveSelection: enableInteractiveSelection,
         buildCounter: buildCounter,

packages/flutter/test/material/text_form_field_test.dart

@@ -32,6 +32,28 @@ void main() {
     expect(textFieldWidget.textAlign, alignment);
   });
 
+  testWidgets('Passes scrollPhysics to underlying TextField', (WidgetTester tester) async {
+    const ScrollPhysics scrollPhysics = ScrollPhysics();
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Material(
+          child: Center(
+            child: TextFormField(
+              scrollPhysics: scrollPhysics,
+            ),
+          ),
+        ),
+      ),
+    );
+
+    final Finder textFieldFinder = find.byType(TextField);
+    expect(textFieldFinder, findsOneWidget);
+
+    final TextField textFieldWidget = tester.widget(textFieldFinder);
+    expect(textFieldWidget.scrollPhysics, scrollPhysics);
+  });
+
   testWidgets('Passes textAlignVertical to underlying TextField', (WidgetTester tester) async {
     const TextAlignVertical textAlignVertical = TextAlignVertical.bottom;