[wp-trac] [WordPress Trac] #22266: onbeforeunload alert always triggers with attachments

[WordPress Trac]

#22266: onbeforeunload alert always triggers with attachments
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 Reporter:  duck_  |       Type:  defect (bug)
   Status:  new    |   Priority:  normal
Milestone:  3.5    |  Component:  Media
  Version:  trunk  |   Severity:  normal
 Keywords:         |
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 '''Steps'''

  1. Create a post with attachments in it
  1. Visit the post's edit screen
  1. Navigate away without modification and see an alert about "The changes
 you made will be lost..."

 Trying to press "Update" and then leaving gives the same result.

 '''Cause'''

 `tinymce.activeEditor.isDirty()` is always returning true because
 attachments are lazy loaded with individual XHRs and so the editor's
 `startContent` property doesn't contain the full HTML for an attachment.
 Once an attachment model has been loaded then it's re-rendered and the
 editor content is different even though the user hasn't made any
 modifications.

 Related: #21390, #21813, [22012]

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Ticket URL: <http://core.trac.wordpress.org/ticket/22266>
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