Re: Tick Reduction

[Stefan Monnier]

Eli Zaretskii [2021-11-20 15:32:04] wrote:
>> From: Stefan Monnier <monnier@iro.umontreal.ca>
>> Cc: larsi@gnus.org,  emacs-devel@gnu.org
>> Date: Sat, 20 Nov 2021 08:11:06 -0500
>> >> Yes, we may have to declare that for functions that "emulate" the
>> >> redisplay internally, the resulting horizontal position info might not
>> >> always be quite right (might not reflect what you'll see on the glass)
>> >> for text tat uses the new alignment functionality :-(
>> > That will break quite a few features, I'm afraid.
>> This will completely depend on the specifics of when/how the answer
>> isn't quite right, of course.
> AFAIU, it will never be right, as long as this kind of alignment is
> used on display.

That completely depends on what the "redisplay emulation" code does.
It could opt to use the old (unreliable) glyph matrix to compute its
(documented as unreliable 🙍) info, in which case it could end up
breaking less often (but more spectacularly when it does)?


        Stefan