bug#12251: 24.2.50; crash in note_mouse_highlight

[martin rudalics]

> Debugger entered--Lisp error: (error "#<window 114> is not a live window")
>   signal(error ("#<window 114> is not a live window"))
>   error("%s is not a live window" #<window 114>)
>   window-normalize-window(#<window 114> t)
>   record-window-buffer(#<window 114>)
>   set-window-configuration(#<window-configuration>)
>   ispell-process-line("^report the filtring lift\n" nil)
>   ispell-region(1 26)
>   ispell-buffer()
>   run-hooks(log-edit-done-hook)
>   log-edit-done()
>   call-interactively(log-edit-done nil nil)

`set-window-configuration' now has

          w = XWINDOW (window);
          if (!NILP (w->buffer)
              && !EQ (w->buffer, p->buffer)
              && !NILP (BVAR (XBUFFER (p->buffer), name)))
            /* If a window we restore gets another buffer, record the
               window's old buffer.  */
            call1 (Qrecord_window_buffer, window);

so it's a complete mystery why this fails.  If it happens too
frequently, please take out the

            call1 (Qrecord_window_buffer, window);

in Fset_window_configuration.  But if you leave it in and the bug
happens again, please try to locate the incriminated window
(`window-tree' could be useful) and tell me whether it's still there and
whether it has a buffer.

Thanks, martin