message: Fix the reject/accept call buttons in canary (mk2)
  Fixes by making
  the accept/reject buttons AccessibleButtons which they should be
  anyway (presumably the role=button makes chrome do the right thing
  with the events). Also swallow the onClick event otherwise that
  propagates out to the room header and causes it to expand/collapse.
diff: /*
  Copyright 2015, 2016 OpenMarket Ltd
  +Copyright 2018 New Vector Ltd
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  @@ -18,6 +19,7 @@ import PropTypes from 'prop-types';
  import MatrixClientPeg from '../../../MatrixClientPeg';
  import dis from '../../../dispatcher';
  import { _t } from '../../../languageHandler';
  +import AccessibleButton from '../elements/AccessibleButton';
  module.exports = React.createClass({
  displayName: 'IncomingCallBox',
  @@ -26,14 +28,16 @@ module.exports = React.createClass({
  incomingCall: PropTypes.object,
  },
  - onAnswerClick: function() {
  + onAnswerClick: function(e) {
  + e.stopPropagation();
  dis.dispatch({
  action: 'answer',
  room_id: this.props.incomingCall.roomId,
  });
  },
  - onRejectClick: function() {
  + onRejectClick: function(e) {
  + e.stopPropagation();
  dis.dispatch({
  action: 'hangup',
  room_id: this.props.incomingCall.roomId,
  @@ -67,14 +71,14 @@ module.exports = React.createClass({
  </div>
  <div className="mx_IncomingCallBox_buttons">
  <div className="mx_IncomingCallBox_buttons_cell">
  - <div className="mx_IncomingCallBox_buttons_decline" onClick={this.onRejectClick}>
  + <AccessibleButton className="mx_IncomingCallBox_buttons_decline" onClick={this.onRejectClick}>
  { _t("Decline") }
  - </div>
  + </AccessibleButton>
  </div>
  <div className="mx_IncomingCallBox_buttons_cell">
  - <div className="mx_IncomingCallBox_buttons_accept" onClick={this.onAnswerClick}>
  + <AccessibleButton className="mx_IncomingCallBox_buttons_accept" onClick={this.onAnswerClick}>
  { _t("Accept") }
  - </div>
  + </AccessibleButton>
  </div>
  </div>
  </div>
  