AJAX in custom fields is broken

[SergeyBiryukov]

Since [21789].

Due to how wp-lists.js currently works, button class should be appended, not prepended.

Isn't this the same as #21829?

No, button IDs are unrelated here.

wp-lists.js uses "attribute starts with" selectors:
http://core.trac.wordpress.org/browser/trunk/wp-includes/js/wp-lists.js?rev=21781#L392

We are removing colons from the class names in wp-lists.js and switching to data-*. Thinking best way to do this would be to move the whole class names to data-wp-lists="...", then we can use that attr for the selectors.

Agreed, closing as a duplicate of #21152 then.