Weston Ruter 1829a2ce27 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.
Fixes #42495.

Built from https://develop.svn.wordpress.org/trunk@42613


git-svn-id: http://core.svn.wordpress.org/trunk@42442 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-01-29 23:56:29 +00:00
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