The 'Pages' (and later the 'Namespaces') multi-select input widget should display the stripey "loading" pending animation while the menu is loading.
It seems there are two points at which we need to show the loading bar:
- while the JS widget is loading, if the user has JS
- while the menu is loading, after the input has been changed
After speaking to @Mooeypoo it seems this task is about point 2, so I've updated the description.
It seems that this is already working, and there's nothing to fix. Testing with network throttling, I see: