[wp-trac] [WordPress Trac] #51421: wp_get_missing_image_subsizes returns thumbnail sizes for animated GIFs

[WordPress Trac]

#51421: wp_get_missing_image_subsizes returns thumbnail sizes for animated GIFs
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 Reporter:  ianmjones     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Media         |    Version:  5.5.1
 Severity:  normal        |   Keywords:  needs-patch
  Focuses:                |
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 While thumbnails are not created for animated GIFs to avoid the problem of
 users picking a thumbnail size to insert into their content and
 unexpectedly getting a static image instead of an animated GIF, they are
 generated for static GIFs.

 The `wp_get_missing_image_subsizes` function however recognizes animated
 GIFs as an image format that can have subsizes generated, and so returns a
 list of missing thumbnail sizes that will never be created.

 This causes problems for various plugins when checking whether all
 required thumbnails exist before commencing processing the GIF etc.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51421>
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