cd089a3f95
Fixes https://github.com/vector-im/riot-web/issues/9986 There's a few reasons for pushing this out to its own place: * In future, we might want to move WhoIsTyping here. * We have multiple composers now, and although they don't send typing notifications, they could (see https://github.com/vector-im/riot-web/issues/10188) * In future we may have status for where/what the user is typing (https://github.com/matrix-org/matrix-doc/issues/437) * The composer is complicated enough - it doesn't need to dedupe typing states too. Note: This makes use of the principles introduced in https://github.com/vector-im/riot-web/issues/8923 and https://github.com/vector-im/riot-web/issues/9090