[wp-trac] [WordPress Trac] #21819: Use an image size for custom headers instead of duplicating an attachment

[WordPress Trac]

#21819: Use an image size for custom headers instead of duplicating an attachment
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 Reporter:  koopersmith                          |       Owner:  joemcgill
     Type:  enhancement                          |      Status:  assigned
 Priority:  high                                 |   Milestone:  4.9
Component:  Media                                |     Version:  3.5
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch needs-testing 2nd-opinion  |     Focuses:
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Changes (by joemcgill):

 * keywords:  needs-patch => has-patch needs-testing 2nd-opinion


Comment:

 [attachment:21819.diff] is a first pass at solving the problem as
 articulated by @melchoyce:

 > People like me upload a million different header images trying to figure
 out what image and crop looks best, and then have two million copies
 hanging out in our media libraries, which is super annoying. 😅

 So far, this tackles 2/3 of the problem by ensuring only one crop exists
 per theme for any given base image and removes old crops from the
 "previous header images" list in the customizer. The final piece of the
 puzzle is to hide all attachments created in the header image context from
 the regular media library, where they just add noise.

 It's worth noting that the current implementation makes use of a new post
 meta key to track the original image from which each crop is created. We
 might want to consider saving this as data to the regular attachment
 metadata array or by making use of the native post_parent field of the
 attachment.

 Work in progress is happening in
 [https://github.com/joemcgill/develop.wordpress/pull/21 this GitHub PR].

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Ticket URL: <https://core.trac.wordpress.org/ticket/21819#comment:37>
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