inputpanel: Do not start a display process while shutting the panel down

The panel is getting destroyed and shouldn't be shown anymore.


(cherry picked from commit 95742bf2)

src/inputpanelv1window.cpp

@@ -69,7 +69,7 @@ void InputPanelV1Window::showTopLevel(OutputInterface *output, InputPanelSurface
 void InputPanelV1Window::allow()
 {
     m_allowed = true;
-    if (m_shouldBeShown && surface()->isMapped()) {
+    if (m_shouldBeShown && !isZombie() && surface()->isMapped()) {
         setReadyForPainting();
         reposition();
         showClient();
@@ -79,7 +79,7 @@ void InputPanelV1Window::allow()
 void InputPanelV1Window::show()
 {
     m_shouldBeShown = true;
-    if (m_allowed && surface()->isMapped()) {
+    if (m_allowed && !isZombie() && surface()->isMapped()) {
         setReadyForPainting();
         reposition();
         showClient();