Don't restore the popup/overlay state

popups are perishable

src/MainWindowBase.cpp

@@ -503,6 +503,10 @@ bool MainWindowBase::deserialize(const LayoutSaver::MainWindow &mw)
         }
     }
 
+    // Commented-out for now, we dont' want to restore the popup/overlay. popups are perishable
+    //if (!mw.overlayedDockWidget.isEmpty())
+    //    overlayOnSideBar(DockRegistry::self()->dockByName(mw.overlayedDockWidget));
+
     return success;
 }