[PATCH] Fix emoji font support

[Marc Lehmann]

On Fri, Feb 07, 2020 at 01:14:53PM +1100, mawww at kakoune.org wrote:
> Any feedback on this patch ?
> 
> Please note that this is different from the alternate font width computation
> patch that has been proposed a few times.

That's good to know - since practically no explanation was given, that one
simply fell through the cracks.

Is there a better explanation available on what this patch actually
does? Preferably with some examples? (For example, what is meant by
scaling applied by Xft - a scaling matrix, some size calculation, or
what? And what does this have to do with emojis only?).

The patch, like any similar patch, has major potential to break things for
a lot of people, so it's unlikely to be applied without a thorough
understanding of what it exactly does, what it solves, and what the
implications are.

> This patch does not change the way rxvt-unicode computes width except in the
> case where the font is a bitmap font on which scaling has been applied by
> libXft.

So it only affects bitmap fonts? Any specific font that exhibits these
issues?

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