Disable textarea auto focus on room-change
Stop focusing chat textarea on room-change for mobile-web.
We already do this for devices we consider phones but the Nexus 7 2013 (tablet) isn't covered by our check currently. But I don't think it should be considered a phone and use the old mobile-menu as there is plenty of space on the bigger tablets for the real thing(new left-menu).
Probably better to just add is-touch-device
utility to check against whether to focus the chat-message textarea.
Fun fact, this is one aspect I contacted Gitter support about before I joined. 2015-5-6 (ticket)