dont crash plasmoid from too fast mouse events

make sure that we delete a valid contextMenu and
not a ghost reference. This could occur from
two-fingers emulating right-click in wayland.

BUG: 397635
FIXED-IN: 0.8.1
(cherry picked from commit afb34a85cf)

plasmoid/package/contents/ui/ContextMenu.qml

@@ -66,6 +66,7 @@ PlasmaComponents.ContextMenu {
             activitiesDesktopsMenu.refresh();
         } else if (status == PlasmaComponents.DialogStatus.Closed) {
             root.startCheckRestoreZoomTimer(100);
+            root.contextMenu = null;
             menu.destroy();
             backend.ungrabMouse(visualParent);
         }
@@ -83,8 +84,9 @@ PlasmaComponents.ContextMenu {
         loadDynamicLaunchActions(visualParent.m.LauncherUrlWithoutIcon);
         // backend.ungrabMouse(visualParent);
         openRelative();
+
         windowsPreviewDlg.contextMenu = true;
-        windowsPreviewDlg.hide();
+        windowsPreviewDlg.hide("8.2");
 
         icList.directRender = false;
 

plasmoid/package/contents/ui/task/TaskDelegate.qml

@@ -1145,7 +1145,11 @@ MouseArea{
             contextMenu = root.createContextMenu(mainItemContainer, modelIndex(), args);
             contextMenu.show();
         } else {
-            root.contextMenu.close();
+            //! make sure that context menu isnt deleted multiple times and creates a crash
+            //! bug case: 397635
+            var cMenu = root.contextMenu;
+            root.contextMenu = null;
+            cMenu.destroy();
         }
     }