Cut/paste of pill mention

[turt2live]

Typing a message to someone, then ctrl+a, cut, paste of the message should also keep the pill

[lukebarnard1]

We only paste text in markdown mode. We could at the copied HTML and convert it to MD but this would require implementing our own HTML to MD converter (the commonmark library obviously only supports MD to HTML). Of course, we could fix the RTE in general by not supporting RT 😇 (draft-js does not support swapping between two different representations natively) (see #4679 for crazy diagram).

[lampholder]

I've made this a P3 because sadly it is (I believe) a lot of effort for a relatively small gain.

Not being able to cut and then paste a pill-containing message in the composer is surprising, and therefore bad. If we can fix this we should, but we shouldn't at this stage invest weeks of effort to resolve this issue :(

[turt2live]

Fixed by some magic in the last year.