[wp-trac] [WordPress Trac] #37566: Update the Twemoji loader to include the rainbow flag

[WordPress Trac]

#37566: Update the Twemoji loader to include the rainbow flag
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 Reporter:  pento        |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Emoji        |    Version:
 Severity:  minor        |   Keywords:  needs-patch
  Focuses:  javascript   |
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 [38179] added support for the rainbow flag to core, but platform
 compatibility is a bit strange, because the flag was defined out of sync
 with the usual Unicode release cycle.

 As such, we end up with a bit of weird scenario - Windows 10 and Android N
 beta support all Unicode 9.0 emoji, but don't support the rainbow flag.
 iOS 10 beta supports both the rainbow flag and all of Unicode 9.0,
 presumably OSX will be updated with the same support.

 Given the cultural relevance of the rainbow flag, I expect it will be
 reasonably popular - Windows 10 and Android N will likely get an update to
 add support for it, but in the mean time, I think it's appropriate for us
 to step in and provide a seamless experience.

 The Twemoji loader already has an exception for flags - it'll load if the
 browser supports everything but flags, and then only replace flag emoji,
 leaving everything else as native rendering.

 I think it would be reasonable to add the rainbow flag to that test, and
 replace all flags if the browser doesn't support the rainbow flag.

 This will also require updating `window.wp.emoji.parse()`, as the rainbow
 flag (and pirate flag, for that matter) don't match the usual flag byte
 sequences.

 Related: #37543.

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Ticket URL: <https://core.trac.wordpress.org/ticket/37566>
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