This is a URL that can be used to start a chat with a user.
- If the user is a guest, setMxId dialog will appear before anything and a defered action will cause `ChatCreateOrReuseDialog` to appear once they've logged in.
- If the user is registered, they will not see the setMxId dialog.
fixes https://github.com/vector-im/riot-web/issues/4034
BaseAvatar can be passed an onClick which is called when it's, er,
clicked, except when it was the default avatar in which case it
merrily ignored it. Make it not ignore it.
React apparently now checks the properties which are set on DOM elements, and
grumbles noisily about unexpected ones. Update BaseAvatar and RoomAvatar so
that they don't set unrelated properties on the DOM elements.
I've been trying to get some tests working under PhantomJS, which appears not
to support String.codePointAt (which is, to be fair, an ES6 addition). For our
limited usecase, it's easier to implement the functionality from first
principles than to try to polyfill support.