I was thinking that writing s/tyop/typo could edit the newest matching message :D
Or maybe make a command to do that, like /s tyop/typo.
I had the idea to implement message edition somehow : https://todo.sr.ht/~reedwade/wee-matter/15
In fact I completely gave up of this idea. Weechat allow old message edition but managing line length is impossible. Multiline edition would be impossible to manage. tl;dr One Weechat history msg != One Mattermost post
Some Weechat plugin did it as Weeslack but the code really is horrible and I don't want this kind of crap here.
If someone found a easy way to do it, with no ugly edge case, I could merge it.