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Re: Can we make set_point_both less expensive?

From: Stefan Monnier
Subject: Re: Can we make set_point_both less expensive?
Date: Sat, 21 Mar 2015 10:03:53 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

>> > Another, related, requirement is that we never call
>> > pre-redisplay-function when point is in a position that is not
>> > supposed to be visible by the user.
>> Do you mean invisible text here?
> No, I mean positions traversed while "this command" is executed.  The
> position shown to the user is the last one of those, but how do we
> ensure that pre-redisplay-function is never run for those?

Ah, I see what you mean now: the command ensures this by not causing
redisplay during its execution.

Since pre-redisplay-function is run only at the beginning of redisplay,
it is only run when we're about to make the current state "visible by
the user".


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