[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        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by joemcgill):

 Hi @galbaras. Thanks for reporting this issue.

 WordPress makes an assumption that if an image size is present in
 attachment metadata, then the file is available to be served to user
 requests and can be included in `srcset` attributes. The best way to clean
 up unused image sizes from the database is to regenerate thumbnails after
 changing themes. You can use a plugin like https://wordpress.org/plugins
 /regenerate-thumbnails/ or the `wp media regenerate` WP-CLI command.

 Does that help?

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Ticket URL: <https://core.trac.wordpress.org/ticket/48194#comment:2>
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