[wp-trac] [WordPress Trac] #35077: Post featured image: image attributes not updated on the fly

[WordPress Trac]

#35077: Post featured image: image attributes not updated on the fly
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 Reporter:  afercia         |      Owner:
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Media           |    Version:  4.4
 Severity:  normal          |   Keywords:
  Focuses:  ui, javascript  |
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 Noticed while investigating on #35076.

 When a post has a featured image, users can click the image to set a new
 featured image or edit the current one. When editing the current image
 attributes, changes are not reflected live in the UI after the image is
 inserted again.
 To reproduce:
 - edit a post with a featured image
 - click on the featured image
 - in the media dialog, update the current featured image alt attribute
 - click the button "Set featured image"
 - check the featured image in your console inspector: the alt attribute is
 not updated

 Looks like the AJAX action `wp_ajax_set_post_thumbnail` takes into account
 only the "set" and "delete" cases, there's nothing to handle an update.

 Additionally, when removing a featured image '''and''' there's some error
 and the response is `0`, `WPRemoveThumbnail` should trigger an alert with
 a message but `setPostThumbnailL10n` is undefined (the related `set-post-
 thumbnail` script is not enqueued at all, I'm guessing it was used in the
 old media uploader).

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Ticket URL: <https://core.trac.wordpress.org/ticket/35077>
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