[wp-trac] [WordPress Trac] #39883: Code hooking on `image_downsize` can no longer assume the file is an image

[WordPress Trac]

#39883: Code hooking on `image_downsize` can no longer assume the file is an image
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 Reporter:  stephdau      |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  4.7.4
Component:  Media         |     Version:  4.7
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by stephdau):

 Replying to [comment:7 azaozz]:
 > Best option imho is to introduce new function(s) specifically for
 handling the cases where a non-image attachment post also contains preview
 image, then revert the changes to the above two functions.

 As discussed, I wholeheartedly agree. Thanks @azaozz :)

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Ticket URL: <https://core.trac.wordpress.org/ticket/39883#comment:8>
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