Fix control dialog grab event

src/controlcenterdialog.cpp

@@ -50,6 +50,9 @@ bool ControlCenterDialog::eventFilter(QObject *object, QEvent *event)
         }
     } else if (event->type() == QEvent::Show) {
         KWindowSystem::setState(winId(), NET::SkipTaskbar | NET::SkipPager | NET::SkipSwitcher);
+    } else if (event->type() == QEvent::Hide) {
+        setMouseGrabEnabled(false);
+        setKeyboardGrabEnabled(false);
     }
 
     return QObject::eventFilter(object, event);