Can not scale well when toggle fullscreen

[shafreeck]

Hi I wrote a atom plugin slides-preview to preview remarkjs slides when writing markdown. But the slide can not scale well when toggle fullscreen.

I think this may caused by calculating scaling before the window going fullscreen

function handleFullscreen(self) {
  var requestFullscreen = utils.getPrefixedProperty(self.containerElement, 'requestFullScreen')
    , cancelFullscreen = utils.getPrefixedProperty(document, 'cancelFullScreen')
    ;

  self.events.on('toggleFullscreen', function () {
    var fullscreenElement = utils.getPrefixedProperty(document, 'fullscreenElement') ||
      utils.getPrefixedProperty(document, 'fullScreenElement');

    if (!fullscreenElement && requestFullscreen) {
      requestFullscreen.call(self.containerElement, Element.ALLOW_KEYBOARD_INPUT);
    }
    else if (cancelFullscreen) {
      cancelFullscreen.call(document);
    }
    self.scaleElements();
  });
}

requestFullscreen.call is an async call. It may occur after calling self.scaleElements . I am not very familiar with javascript, so I am wondering if I am right ?