PreventDefault on callBack hide function bug

Created by: LuigiOnGitHub

Hi in Bootstrap (v4.0.0-beta): modal.js release I found that the following code in Modal.prototype.hide function (starting line 1982 of bootstrap.js)

var transition = Util.supportsTransitionEnd() && $(this._element).hasClass(ClassName.FADE);
if (transition) {
  this._isTransitioning = true;
}

should be put after the hideEvent trigger otherwise the property isTransitioning will be true at the next call and therefore a not prevented callback on hide will be inhibited.

correct code starting at line 1982 should be:

var hideEvent = $.Event(Event.HIDE);

$(this._element).trigger(hideEvent);

if (!this._isShown || hideEvent.isDefaultPrevented()) {
  return;
}

var transition = Util.supportsTransitionEnd() && $(this._element).hasClass(ClassName.FADE);

if (transition) {
    this._isTransitioning = true;
}

regards