MultiSelect Change Event - Potential Bug

[rhurlbatt]

When using the MultiSelect , if the change event includes any code that changes whether the MultiSelect is enabled or disabled, the initial (and sometimes subsequent) changes to the selected don't fire.

If the multiple option is selected, then the first selection immediately closes the selection window.

Here is a Clone and Example.

Commenting out Line 21 which enables the MultiSelect makes it work as expected.

I have had a look at the code for the component, but my kung fu is not strong enough.
Would some be able to have a look and point me in the right direction for creating a fix?