message: use room method for checking power levels
  as it is always are of the syncing user's membership
  in case of lazy loading members
diff: @@ -309,8 +309,8 @@ export default class MessageComposer extends React.Component {
  </div>;
  }
  - const canSendMessages = !this.state.tombstone && this.props.room.currentState.maySendMessage(
  - MatrixClientPeg.get().credentials.userId);
  + const canSendMessages = !this.state.tombstone &&
  + this.props.room.maySendMessage();
  if (canSendMessages) {
  // This also currently includes the call buttons. Really we should
  