Joe McGill 2cce6bb55a Customizer: Improve handling of crops in the media library.
This is a follow up on r41732, implementing the following improvements:

* Attachment parent info is now stored in attachment meta rather than a 
separate post meta key.
* Attachments created from contextual crops (e.g. header, logos, etc.) are
filtered out of the media library using a new `_filterContext` method in
`wp.media.controller.Library`.

Props joemcgill, westonruter.
See #21819.


git-svn-id: https://develop.svn.wordpress.org/trunk@41937 602fd350-edb4-49c9-b593-d223f7449a82
2017-10-19 04:17:31 +00:00
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