message: Fixes 2 issues with Dialog closing
  + Upload Confirmation dialog would just change focus on ESC and not close
  + Keywords Dialog in UserSettings would also close UserSettings because event bubbled up
diff: @@ -57,6 +57,12 @@ export default React.createClass({
  }
  },
  + // Don't let key down events get any further, so they only trigger this and nothing more
  + _onKeyDown: function(e) {
  + e.stopPropagation();
  + e.preventDefault();
  + },
  +
  // Must be when the key is released (and not pressed) otherwise componentWillUnmount
  // will focus another element which will receive future key events
  _onKeyUp: function(e) {
  @@ -81,7 +87,7 @@ export default React.createClass({
  const TintableSvg = sdk.getComponent("elements.TintableSvg");
  return (
  - <div onKeyUp={this._onKeyUp} className={this.props.className}>
  + <div onKeyDown={this._onKeyDown} onKeyUp={this._onKeyUp} className={this.props.className}>
  <AccessibleButton onClick={this._onCancelClick}
  className="mx_Dialog_cancelButton"
  >
  