message: support channel names with slash in name/alias
diff: @@ -1569,9 +1569,17 @@ export default createReactClass({
  action: 'start_post_registration',
  });
  } else if (screen.indexOf('room/') == 0) {
  - const segments = screen.substring(5).split('/');
  - const roomString = segments[0];
  - let eventId = segments.splice(1).join("/"); // empty string if no event id given
  + // Rooms can have the following formats:
  + // #room_alias:domain or !opaque_id:domain
  + const room = screen.substring(5);
  + const domainOffset = room.indexOf(':') + 1; // 0 in case room does not contain a :
  + let eventOffset = room.length;
  + // room aliases can contain slashes only look for slash after domain
  + if (room.substring(domainOffset).indexOf('/') > -1) {
  + eventOffset = domainOffset + room.substring(domainOffset).indexOf('/');
  + }
  + const roomString = room.substring(0, eventOffset);
  + let eventId = room.substring(eventOffset + 1); // empty string if no event id given
  // Previously we pulled the eventID from the segments in such a way
  // where if there was no eventId then we'd get undefined. However, we
  