Why doesn't shown/hidden handler work in metisMenu?

Question

JavaScript

Hello!

There is a menu on jquery menu site metisMenu. In the menu, you need to draw all sorts of notifications (for example, about unread messages). Here is an example . The idea is that if there is only one notification inside the collapsed menu, then you need to copy it to the collapsed menu itself. If there are many of them, then display some default text. Now the main problem and the crux of the matter. The fiddle normally handles the 'shown.metisMenu' and 'hidden.metisMenu' events (the end of the process of expanding/collapsing the menu) and starts the function of redrawing notifications for collapsed menus. It is necessary to hang this function on these events, and not just on clicks on the menu (I tried it at the beginning), because the function determines the collapse / expansion of the menu by the presence of the 'in' class for the element

• menu list. Then the problems begin with the fact that metisMenu.min.js itself, for example, has not yet worked out to the end and has not updated all the parameters, and the function works with their old values. That is, the click handler works before the click handler in metisMenu itself. And in principle, on the same fiddle, everything works exactly as planned. And on the site itself (unfortunately, I can’t give a link, because it is used on the local network), these same handlers do not work. Of course, I understand that it’s hard, without seeing the entire code of the site, to guess what’s broken there, but maybe someone has any ideas? I have already commented out all the lines of code that I found, where one way or another something is done with the menu - it does not help. I also tried preventDefault: false in the constructor of the mestizo menu to pass - it does not help either. Can anyone have any ideas what can interfere and break the handler?
  PS In the example, I tried as much as possible to recreate the part of the code that works on the site and is responsible for this functionality.
  Thanks in advance!