message: Don't let click events propagate out of context menus
diff: @@ -226,6 +226,11 @@ export class ContextMenu extends React.PureComponent<IProps, IState> {
  }
  };
  + private onClick = (ev: React.MouseEvent) => {
  + // Don't allow clicks to escape the context menu wrapper
  + ev.stopPropagation();
  + };
  +
  private onKeyDown = (ev: React.KeyboardEvent) => {
  // don't let keyboard handling escape the context menu
  ev.stopPropagation();
  @@ -383,6 +388,7 @@ export class ContextMenu extends React.PureComponent<IProps, IState> {
  className={classNames("mx_ContextualMenu_wrapper", this.props.wrapperClassName)}
  style={{ ...position, ...wrapperStyle }}
  onKeyDown={this.onKeyDown}
  + onClick={this.onClick}
  onContextMenu={this.onContextMenuPreventBubbling}
  >
  <div
  