Hero animation support

Simple solution to work Hero animation with modal_bottom_sheet

@@ -127,7 +127,7 @@ class _ModalBottomSheetState<T> extends State<_ModalBottomSheet<T>> {
   }
   }
 }
 }
 
 
-class ModalBottomSheetRoute<T> extends PopupRoute<T> {
+class ModalBottomSheetRoute<T> extends PageRoute<T> {
   ModalBottomSheetRoute({
   ModalBottomSheetRoute({
     this.closeProgressThreshold,
     this.closeProgressThreshold,
     this.containerBuilder,
     this.containerBuilder,
@@ -168,8 +168,14 @@ class ModalBottomSheetRoute<T> extends PopupRoute<T> {
 
 
   @override
   @override
   bool get barrierDismissible => isDismissible;
   bool get barrierDismissible => isDismissible;
+  
+  @override
+  bool get maintainState => false; //idk but needed
 
 
   @override
   @override
+  bool get opaque => false; //transparency
+  
+  @override
   final String? barrierLabel;
   final String? barrierLabel;
 
 
   @override
   @override