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Emacs normally tries to redisplay the screen whenever it waits for input. With the following function, you can request an immediate attempt to redisplay, in the middle of Lisp code, without actually waiting for input.
This function tries immediately to redisplay. The optional
argument force, if non-nil, forces
the redisplay to be performed, instead of being preempted if
input is pending.
The function returns t if it actually tried
to redisplay, and nil otherwise. A value of
t does not mean that redisplay proceeded to
completion; it could have been preempted by newly arriving
input.
Although redisplay tries immediately to
redisplay, it does not change how Emacs decides which parts of
its frame(s) to redisplay. By contrast, the following function
adds certain windows to the pending redisplay work (as if their
contents had completely changed), but does not immediately try to
perform redisplay.
This function forces some or all windows to be updated the
next time Emacs does a redisplay. If object is a
window, that window is to be updated. If object is
a buffer or buffer name, all windows displaying that buffer
are to be updated. If object is nil
(or omitted), all windows are to be updated.
This function does not do a redisplay immediately; Emacs
does that as it waits for input, or when the function
redisplay is called.
A function run just before redisplay. It is called with
one argument, the set of windows to be redisplayed. The set
can be nil, meaning only the selected window, or
t, meaning all the windows.
This hook is run just before redisplay. It is called once
in each window that is about to be redisplayed, with
current-buffer set to the buffer displayed in
that window.
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