Fixed a problem with the FAB position if a maximum width was set on the bottom...

Fixed a problem with the FAB position if a maximum width was set on the bottom sheet of a scaffold. (#82234)

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

@@ -283,6 +283,7 @@ class _BottomSheetState extends State<BottomSheet> {
     if (constraints != null) {
       bottomSheet = Align(
         alignment: Alignment.bottomCenter,
+        heightFactor: 1.0,
         child: ConstrainedBox(
           constraints: constraints,
           child: bottomSheet,

packages/flutter/test/material/bottom_sheet_test.dart

@@ -910,9 +910,10 @@ void main() {
             constraints: BoxConstraints(maxWidth: 80),
           ),
         ),
-        home: const Scaffold(
-          body: Center(child: Text('body')),
-          bottomSheet: Text('BottomSheet'),
+        home: Scaffold(
+          body: const Center(child: Text('body')),
+          bottomSheet: const Text('BottomSheet'),
+          floatingActionButton: FloatingActionButton(onPressed: () {}, child: const Icon(Icons.add)),
         ),
       ));
       expect(find.text('BottomSheet'), findsOneWidget);
@@ -921,6 +922,12 @@ void main() {
         tester.getRect(find.text('BottomSheet')),
         const Rect.fromLTRB(360, 558, 440, 600),
       );
+      // Ensure the FAB is overlapping the top of the sheet
+      expect(find.byIcon(Icons.add), findsOneWidget);
+      expect(
+        tester.getRect(find.byIcon(Icons.add)),
+        const Rect.fromLTRB(744, 544, 768, 568),
+      );
     });
 
     testWidgets('Theme constraints used for showBottomSheet', (WidgetTester tester) async {