MSC4230: Flag for animated images (#4230)
* Placeholder for animated image flag msc
* First draft
* Get the prefixed flag right
* Use is_animated because that's what michael's impl uses
* One day I will learn how to spell this word
Today is not that day.
* Use specific image type
* Typo
Co-authored-by: R Midhun Suresh <rmidhunsuresh@gmail.com>
* Not a string
Co-authored-by: Will Hunt <will@half-shot.uk>
* Typo
Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
* Hopefully clarify
* add that we can't tell it's animated
* use formal SHOULD
* Fix missing words
* Clarify that browsers are awful
* advise leaving flag unset if a client can't tell
* Apply suggestions from code review
Co-authored-by: Kim Brose <2803622+HarHarLinks@users.noreply.github.com>
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Co-authored-by: R Midhun Suresh <rmidhunsuresh@gmail.com>
Co-authored-by: Will Hunt <will@half-shot.uk>
Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
Co-authored-by: Travis Ralston <travisr@matrix.org>
Co-authored-by: Kim Brose <2803622+HarHarLinks@users.noreply.github.com>
