cursor position and size update

Signed-off-by: fufesou <shuanglongchen@yeah.net>

flutter/lib/desktop/widgets/material_mod_popup_menu.dart

@@ -790,6 +790,7 @@ class _PopupMenuRoute<T> extends PopupRoute<T> {
   _PopupMenuRoute({
     required this.position,
     required this.items,
+    this.menuWrapper,
     this.initialValue,
     this.elevation,
     required this.barrierLabel,
@@ -802,6 +803,7 @@ class _PopupMenuRoute<T> extends PopupRoute<T> {
 
   final RelativeRect position;
   final List<PopupMenuEntry<T>> items;
+  final MenuWrapper? menuWrapper;
   final List<Size?> itemSizes;
   final T? initialValue;
   final double? elevation;
@@ -844,11 +846,14 @@ class _PopupMenuRoute<T> extends PopupRoute<T> {
       }
     }
 
-    final Widget menu = _PopupMenu<T>(
+    Widget menu = _PopupMenu<T>(
       route: this,
       semanticLabel: semanticLabel,
       constraints: constraints,
     );
+    if (this.menuWrapper != null) {
+      menu = this.menuWrapper!(menu);
+    }
     final MediaQueryData mediaQuery = MediaQuery.of(context);
     return MediaQuery.removePadding(
       context: context,
@@ -1035,6 +1040,7 @@ Future<T?> showMenu<T>({
   required BuildContext context,
   required RelativeRect position,
   required List<PopupMenuEntry<T>> items,
+  MenuWrapper? menuWrapper,
   T? initialValue,
   double? elevation,
   String? semanticLabel,
@@ -1062,6 +1068,7 @@ Future<T?> showMenu<T>({
   return navigator.push(_PopupMenuRoute<T>(
     position: position,
     items: items,
+    menuWrapper: menuWrapper,
     initialValue: initialValue,
     elevation: elevation,
     semanticLabel: semanticLabel,
@@ -1094,6 +1101,8 @@ typedef PopupMenuCanceled = void Function();
 typedef PopupMenuItemBuilder<T> = List<PopupMenuEntry<T>> Function(
     BuildContext context);
 
+typedef MenuWrapper = Widget Function(Widget child);
+
 /// Displays a menu when pressed and calls [onSelected] when the menu is dismissed
 /// because an item was selected. The value passed to [onSelected] is the value of
 /// the selected menu item.
@@ -1124,6 +1133,7 @@ class PopupMenuButton<T> extends StatefulWidget {
   const PopupMenuButton({
     Key? key,
     required this.itemBuilder,
+    this.menuWrapper,
     this.initialValue,
     this.onHover,
     this.onSelected,
@@ -1151,6 +1161,9 @@ class PopupMenuButton<T> extends StatefulWidget {
   /// Called when the button is pressed to create the items to show in the menu.
   final PopupMenuItemBuilder<T> itemBuilder;
 
+  /// Menu wrapper.
+  final MenuWrapper? menuWrapper;
+
   /// The value of the menu item, if any, that should be highlighted when the menu opens.
   final T? initialValue;
 
@@ -1333,6 +1346,7 @@ class PopupMenuButtonState<T> extends State<PopupMenuButton<T>> {
         context: context,
         elevation: widget.elevation ?? popupMenuTheme.elevation,
         items: items,
+        menuWrapper: widget.menuWrapper,
         initialValue: widget.initialValue,
         position: position,
         shape: widget.shape ?? popupMenuTheme.shape,