Re: Scrolling commands and skipping redisplay, was: Re: emacs rendering comparisson between emacs23 and emacs26.3

[Eli Zaretskii]

> From: Stefan Monnier <address@hidden>
> Cc: address@hidden,  address@hidden,  address@hidden,
>   address@hidden,  address@hidden,  address@hidden
> Date: Mon, 20 Apr 2020 14:51:07 -0400
> 
> > by the canonical line height, it doesn't count screen lines.  So if
> > some lines in the buffer are displayed taller than the default face,
> > you will see a lot of recentering regardless of what you do.
> 
> Good point.  So any "unusual" character which ends up selecting
> a different font that happens to be slightly taller will disrupt the
> "conservative" scroll.

A tall character or an image, yes.

> Tho, I guess we should consider "1" as meaning "strictly smaller than
> 2.0", in which case a line would have to be twice as tall as a normal
> line before we cause a recenter.

No, I think the inequality is done in pixels, if I'm not
misremembering.