[wp-trac] [WordPress Trac] #20299: Preview changes on a published post makes all post meta "live"

[WordPress Trac]

#20299: Preview changes on a published post makes all post meta "live"
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 Reporter:  jakemgold                            |       Owner:
     Type:  defect (bug)                         |  adamsilverstein
 Priority:  normal                               |      Status:  assigned
Component:  Revisions                            |   Milestone:  Future
 Severity:  major                                |  Release
 Keywords:  has-patch needs-testing dev-         |     Version:  3.3.1
  feedback 4.6-early                             |  Resolution:
                                                 |     Focuses:
                                                 |  administration
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Comment (by westonruter):

 @adamsilverstein in regards to #11049 and not being able to preview a
 change to a page template, will the scope here also include addressing the
 issue where changing the featured image actually makes it go live
 immediately (the opposite problem from page template)? I couldn't find a
 trac ticket about this, but as a user I would expect to be able to set a
 featured image and then click Preview, and then actually _preview_ that
 change without it going live for all. The solution seems as simple as
 changing the featured image behavior to populate a hidden `_thumbnail_id`
 input so that it gets sent along with all of the other postmeta upon
 hitting Save or Preview. (In other words, the
 `wp_ajax_set_post_thumbnail()` should be eliminated.)

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Ticket URL: <https://core.trac.wordpress.org/ticket/20299#comment:57>
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