Sergey Biryukov fc91f93c7a Customize: Ensure media playlists get initialized after selective refresh; expose new wp.playlist.initialize() API.
In particular allows audio and video playlists to be added to the Text widget and previewed.

Props bpayton, westonruter.
See #40854.
Merges [42613], [42617] to the 4.9 branch.
Fixes #42495.

git-svn-id: https://develop.svn.wordpress.org/branches/4.9@42622 602fd350-edb4-49c9-b593-d223f7449a82
2018-01-30 14:55:25 +00:00
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