[wp-trac] [WordPress Trac] #65161: Give an error message when a non-image is uploaded for site icon

[WordPress Trac]

#65161: Give an error message when a non-image is uploaded for site icon
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 Reporter:  Presskopp     |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Media         |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:
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Comment (by Presskopp):

 Nice approach, but I assume you should avoid using `window.alert()`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/65161#comment:4>
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