Won’t Fix

link jQuery Core

jQuery Core Won't-Fix issues are tracked and explained on a jQuery Wiki page.

link jQuery UI

link change Event

Widgets that enhance form elements manipulate their element's value programmatically, therefore we cannot guarantee that a native change event will fire when the element's value changes.

These widgets do all provide a custom change event. For example, the autocomplete widget fires an autocompletechange event.

For further reference:

#8878

link Cloning

Cloning widgets is not supported by jQuery UI. It is simply too much effort specific to each widget to handle for an uncommon use case. If you are interested in adding this functionality feel free to contact the jQuery UI team.