Fix ContextMenu submenu click bug

src/AtomUI.Controls/Menu/ContextMenu.cs

@@ -69,6 +69,7 @@ public class ContextMenu : AvaloniaContextMenu,
             _popup.SetIgnoreIsOpenChanged(true);
             _popup.IsMotionAwareOpen = true;
         };
+        
     }
     
     private bool MenuPopupClosePredicate(IPopupHostProvider hostProvider, RawPointerEventArgs args)
@@ -81,6 +82,11 @@ public class ContextMenu : AvaloniaContextMenu,
                 popupRoots.UnionWith(MenuItem.CollectPopupRoots(childMenuItem));
             }
         }
+
+        if (_popup?.Host is PopupRoot popupRoot)
+        {
+            popupRoots.Add(popupRoot);
+        }
         return !popupRoots.Contains(args.Root);
     }
 

src/AtomUI.Controls/Menu/MenuItem.cs

@@ -146,6 +146,7 @@ public class MenuItem : AvaloniaMenuItem
     private bool MenuPopupClosePredicate(IPopupHostProvider hostProvider, RawPointerEventArgs args)
     {
         var popupRoots = CollectPopupRoots(this);
+        
         return !popupRoots.Contains(args.Root);
     }