* Don't consider textual characters to be emoji
We were using emojibase-regex to match emoji within messages. However, the docs (https://emojibase.dev/docs/regex/) state that this regex matches both emoji and text presentation characters. This is not what we want, and will result in false positives for characters like '↔' that could turn into an emoji if paired with a variation selector. Unfortunately, none of the other regexes provided by Emojibase do what we want either (https://github.com/milesj/emojibase/issues/174). In the meantime, browser support for the RGI_Emoji character sequence class has made it feasible to write an emoji regex by hand, so that's what I've done.
* Add a fallback for BIGEMOJI_REGEX as well
* Use data-mx-color for rainbows
The font tag may be deprecated soon (https://github.com/matrix-org/matrix-spec/pull/1739)
Signed-off-by: Tulir Asokan <tulir@maunium.net>
* Update tests
Signed-off-by: Tulir Asokan <tulir@maunium.net>
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Signed-off-by: Tulir Asokan <tulir@maunium.net>
* Enable custom themes to theme Compound
* Remove the now redundant username color variables
They are replaced by the Compound theming options (specifically, username colors can be themed by changing the color of Compound's decorative color tokens).
Robin