set cons [console::new "Merge" $msg]
        console::exec $cons $cmd \
                [namespace code [list _finish $revcnt $cons]]
-       bind $w <Destroy> {}
+
+       wm protocol $w WM_DELETE_WINDOW {}
        destroy $w
 }
 
        bind $w <$M1B-Key-Return> $_start
        bind $w <Visibility> "grab $w; focus $w.source.l"
        bind $w <Key-Escape> "unlock_index;destroy $w"
-       bind $w <Destroy> unlock_index
+       wm protocol $w WM_DELETE_WINDOW "unlock_index;destroy $w"
        wm title $w "[appname] ([reponame]): Merge"
        tkwait window $w
 }