[wp-trac] [WordPress Trac] #48194: Unregistered image sizes used for IMG tag "srcset"

[WordPress Trac]

#48194: Unregistered image sizes used for IMG tag "srcset"
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 Reporter:  galbaras      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Media         |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Following design changes, previously-generated thumbnails remain on the
 site, along with matching post meta entries linked to the respective
 attachment. WordPress then uses those to produce IMG tags.

 In fact, these thumbnails are referenced even when the files don't exist
 on the site anymore, following a cleanup.

 I think WordPress should only use thumbnail URLs for registered image
 sizes.

 For bonus points, there can be a way to remove unregistered size
 references from attachment meta, perhaps in a Media > Audit admin page,
 which lets the user decide what to remove and what to keep.

 For context, I've just cleaned images on a site and found a lot of legacy
 references to thumbnails of previously registered sizes in IMG tags. Media
 management and cleanup plugins I used could only detect the redundant meta
 data when I re-registered the old sizes temporarily.

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Ticket URL: <https://core.trac.wordpress.org/ticket/48194>
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