Fix a potential kdesktop_lock malfunction whereby the user would not be presented with the login screen

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdebase@1258267 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

kdesktop/lock/lockprocess.cc

@@ -1515,6 +1515,11 @@ bool LockProcess::checkPass()
         if (mAutoLogout)
             killTimer(mAutoLogoutTimerId);
 
+        // Make sure we never launch the SAK or login dialog if windows are being closed down
+        // Otherwise we can get stuck in an irrecoverable state where any attempt to show the login screen is instantly aborted
+        if (trinity_desktop_lock_closing_windows)
+            return 0;
+
         if (trinity_desktop_lock_use_sak) {
             // Wait for SAK press before continuing...
             SAKDlg inDlg( this );