Amusingly, for https://riot.im we just shelved our WYSIWYG editor efforts after trying two completely separate implementations over the years (one via Draft.js, the other via Slate.js) because: a) it's a nightmare to get right, b) nobody used it anyway (it was optional), c) chat isn't a wordprocessor, d) markdown (commonmark) + floating formatting toolbar is good enough.
Our current editor was written from scratch (codenamed CIDER), and seems to work pretty well for markdown input + some semantic elements like prettified usernames, room names, etc.
Our current editor was written from scratch (codenamed CIDER), and seems to work pretty well for markdown input + some semantic elements like prettified usernames, room names, etc.
https://github.com/matrix-org/matrix-react-sdk/blob/develop/... tells all about CIDER, and https://blog.riot.im/riot-web-1-5/ gives the full context if anyone cares :)