[wp-trac] [WordPress Trac] #40439: Save progress of intermediate image creation after upload

[WordPress Trac]

#40439: Save progress of intermediate image creation after upload
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 Reporter:  mikeschroder                         |       Owner:  (none)
     Type:  enhancement                          |      Status:  new
 Priority:  normal                               |   Milestone:  5.0
Component:  Media                                |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch needs-testing needs-unit-  |     Focuses:  ui
  tests                                          |
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Changes (by azaozz):

 * keywords:  needs-patch => has-patch needs-testing needs-unit-tests
 * focuses:   => ui


Comment:

 In 40439.patch:
 - Abstract/expose creating of an image sub-size in class-wp-image-editor-
 imagick.php and class-wp-image-editor-gd.php. Note that I didn't change
 the signature of Class_WP_Image_Editor as "something" may be extending it.
 - Refactor `wp_generate_attachment_metadata()` a bit, move the creation of
 image sub-sizes to a new function: `_wp_create_image_subsizes()`.
 - Add couple more helper functions for creating and checking of image sub-
 sizes.
 - Add `wp_update_image_attachment_sizes()` that tries to create all
 missing sub-sized of an image.
 - Add `wp_check_image_attachment_sizes()` that is used to check whether
 all sub-sizes were created successfully.
 - Use the above function in the Media Library list-table to check for
 missing image sizes and add a button if any are found, so the user can
 create them.
 - Add AJAX for the above.

 This started as a "quick test" to see exactly how difficult it may be to
 add that functionality (I know, it's Sunday, but...) :)

 TODO: needs UI/UX review and perhaps some design for how to add the
 messages and the button to the Media Library grid view (and the media
 modal?). Also probably needs some cleanup, and of course: testing!

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Ticket URL: <https://core.trac.wordpress.org/ticket/40439#comment:10>
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