kmail: Disable message actions due to a folder is loading

Signed-off-by: Denis Kozadaev <denis@dilos.org>

kmail/kmmainwidget.cpp

@@ -2033,6 +2033,11 @@ void KMMainWidget::folderSelected( KMFolder* aFolder, bool forceJumpToUnread )
            this, TQ_SLOT( updateMarkAsReadAction() ) );
     disconnect( mFolder, TQ_SIGNAL( msgRemoved( KMFolder * ) ),
            this, TQ_SLOT( updateMarkAsReadAction() ) );
+    /* Disable all possible actions due to mFolder is loading */
+    mFolder = nullptr;
+    mHeaders->setFolder( 0 );
+    updateFolderMenu();
+    updateMessageActions();
   }
 
   mFolder = aFolder;