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From: martin rudalics
Subject: run_window_configuration_change_hook
Date: Mon, 18 Apr 2011 15:15:54 +0200
User-agent: Thunderbird (Windows/20090302)

With current trunk and emacs -Q evaluate the following code:

(let* ((old-window (selected-window))
       (new-frame (make-frame))
       (new-window (frame-root-window new-frame)))
  (set-window-buffer new-window (other-buffer))
  (select-window old-window)
  (let ((current-buffer (window-buffer new-window)))
    (split-window new-window)
    (cons current-buffer (current-buffer))))

From the return value I can deduce that `split-window' changes the
current buffer.  This would be incorrect.  IIUC the behavior is due to
the fact that run_window_configuration_change_hook

  if (SELECTED_FRAME () != f)
      record_unwind_protect (select_frame_norecord, Fselected_frame ());
      select_frame_norecord (frame);

  /* Use the right buffer.  Matters when running the local hooks.  */
  if (current_buffer != XBUFFER (Fwindow_buffer (Qnil)))
      record_unwind_protect (Fset_buffer, Fcurrent_buffer ());
      Fset_buffer (Fwindow_buffer (Qnil));


  unbind_to (count, Qnil);

first restores the current buffer and afterwards the selected frame
which can make another buffer current.  Inverting the order of the two
clauses resolves the problem for me.


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