[Standards] Support for stickers (custom emojis)

Sam Whited sam at samwhited.com
Sat Oct 19 16:41:19 UTC 2019

On Sat, Oct 19, 2019, at 04:57, JC Brand wrote:
> You might still have an offset in between two codepoints that should
> ideally be shown together like "EU" making the EU flag, but this seems
> less of an issue to me.

I don't know if this is better or not, and I'm still not sure how best
to handle it. If you end up with text in the middle of a UTF-8 encoding,
at least that's clearly an error. If it's in between the two letters in
a flag emoji, that's not necessarily an error and there are tons of
different ways you could handle it, which seems much more complex.
Does this break the flag emoji back into the letter glyphs that are
shown if it doesn't form a flag? What if it's between something and a
zero-width joiner that would join it to another glyph, does that split
that and now you have a dangling joiner? From a code perspective does
this mean that highlighting always has to integrate with the text
rendering engine? This seems like a *major* downside to me, as it likely
makes the code much more complicated, and we may or may not even have
the ability to manipulate how the text rendering engine handles things.


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