message: support contextual menus without chevron
diff: @@ -49,7 +49,7 @@ export default class ContextualMenu extends React.Component {
  menuHeight: PropTypes.number,
  chevronOffset: PropTypes.number,
  menuColour: PropTypes.string,
  - chevronFace: PropTypes.string, // top, bottom, left, right
  + chevronFace: PropTypes.string, // top, bottom, left, right or none
  // Function to be called on menu close
  onFinished: PropTypes.func,
  menuPaddingTop: PropTypes.number,
  @@ -113,7 +113,6 @@ export default class ContextualMenu extends React.Component {
  render() {
  const position = {};
  let chevronFace = null;
  -
  const props = this.props;
  if (props.top) {
  @@ -137,6 +136,8 @@ export default class ContextualMenu extends React.Component {
  if (props.chevronFace) {
  chevronFace = props.chevronFace;
  }
  + const hasChevron = chevronFace && chevronFace !== "none";
  +
  if (chevronFace === 'top' || chevronFace === 'bottom') {
  chevronOffset.left = props.chevronOffset;
  } else {
  @@ -174,11 +175,12 @@ export default class ContextualMenu extends React.Component {
  `;
  }
  - const chevron = <div style={chevronOffset} className={"mx_ContextualMenu_chevron_" + chevronFace} />;
  + const chevron = hasChevron ? <div style={chevronOffset} className={"mx_ContextualMenu_chevron_" + chevronFace} /> : undefined;
  const className = 'mx_ContextualMenu_wrapper';
  const menuClasses = classNames({
  'mx_ContextualMenu': true,
  + 'mx_ContextualMenu_noChevron': chevronFace === 'none',
  'mx_ContextualMenu_left': chevronFace === 'left',
  'mx_ContextualMenu_right': chevronFace === 'right',
  'mx_ContextualMenu_top': chevronFace === 'top',
  