opt scroll physics

Signed-off-by: dom <githubaccount56556@proton.me>

lib/common/widgets/scroll_behavior.dart

@@ -3,6 +3,10 @@ import 'dart:io' show Platform;
 import 'package:flutter/gestures.dart' show PointerDeviceKind;
 import 'package:flutter/material.dart';
 
+const _clampingPhysics = ClampingScrollPhysics();
+const _bouncingPhysics = BouncingScrollPhysics();
+const _bouncingDesktopPhysics = BouncingScrollPhysics(decelerationRate: .fast);
+
 class CustomScrollBehavior extends MaterialScrollBehavior {
   const CustomScrollBehavior();
 
@@ -29,6 +33,17 @@ class CustomScrollBehavior extends MaterialScrollBehavior {
     return child;
   }
 
+  @override
+  ScrollPhysics getScrollPhysics(BuildContext context) {
+    if (Platform.isIOS) {
+      return _bouncingPhysics;
+    }
+    if (Platform.isMacOS) {
+      return _bouncingDesktopPhysics;
+    }
+    return _clampingPhysics;
+  }
+
   @override
   Set<PointerDeviceKind> get dragDevices => desktopDragDevices;
 }