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(elisp)Forcing Redisplay

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Forcing Redisplay
=================

   Emacs redisplay normally stops if input arrives, and does not happen
at all if input is available before it starts.  Most of the time, this
is exactly what you want.  However, you can prevent preemption by
binding `redisplay-dont-pause' to a non-`nil' value.

 - Variable: redisplay-dont-pause
     If this variable is non-`nil', pending input does not prevent or
     halt redisplay; redisplay occurs, and finishes, regardless of
     whether input is available.  This feature is available as of Emacs
     21.

   You can request a display update, but only if no input is pending,
with `(sit-for 0)'.  To force a display update even when input is
pending, do this:

     (let ((redisplay-dont-pause t))
       (sit-for 0))