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bug#10539: 24.0.92; low display-time-interval makes Emacs slow

From: Stefan Monnier
Subject: bug#10539: 24.0.92; low display-time-interval makes Emacs slow
Date: Mon, 30 Jan 2012 17:01:53 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.92 (gnu/linux)

>> > I don't mind, but I'd like Chong's and Stefan's opinion on this first.
>> > The way the function is (was) implemented it exploits intimate
>> > knowledge about redisplay's inner workings.  Maybe we should simply
>> > expose to Lisp the corresponding internal variables instead, or
>> > provide Lisp primitive functions to set them?
>> I don't mind the current code, but it deserves a comment pointing to the
>> corresponding part of the C code that is affected.
> The two internal variables in question (update_mode_lines and
> windows_or_buffers_changed) affect many parts of the display code, and
> also appear in buffer.c, window.c, and a bunch of other files.  Just
> grep for them, they are all over the place.

Indeed, that's why a comment is needed: the corresponding info is not
easy to find.

> So I'm unsure what you mean by "corresponding part of the C code".

The corresponding parts would be:
1- the place where the C code (run via the Elisp code of
   force-mode-line-update) sets those vars.
2- the place in the C code where those vars are checked later on during
   redisplay so that they cause the mode-line to be refreshed.


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