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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 18:14:32 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

> good enough job.  The position of point/cursor shown to the user is
> known _at_the_end_ of redisplay, not at its beginning.  the latter can
> approximate the former, but only approximate.

It's known well enough in pre-redisplay-function that we can use this
information to setup an overlay to highlight the region.  And we haven't
had bug-reports yet about this "approximation" being imprecise (tho
I admittedly fixed just such a bug between 24.4 and 25.1).


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