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From: Richard Stallman <rms@gnu.org>
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Subject: Re: CVS Emacs list-buffer-noselect calls set-window-buffer,
	displays every buffer briefly!
Date: Tue, 07 Sep 2004 20:22:15 -0400
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    Near line 2979 of src/window.c, in function set_window_buffer() is this code:

      /* Update time stamps of buffer display.  */
      if (INTEGERP (b->display_count))
	XSETINT (b->display_count, XINT (b->display_count) + 1);
      b->display_time = Fcurrent_time ();

    Could that be causing the redisplay?

Redisplay only occurs when something calls the C function `redisplay'
or `redisplay_preserve_echo_area'.

(Neither of these fields display_count and display_time seems to have
any effect on redisplay.)