[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 adamsilverstein):

 Replying to [comment:57 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)?

 Yes, this plugin plus some whitelisting would address this issue.

 Previews currently rely on an autosave revision to load their data, and
 since post meta like featured image is not revisioned it gets saved, then
 the stored value 'previewed'.

 All that should be required to fix this (after installing the plugin) is
 whitelisting `_thumbnail_id` with the `wp_post_revision_meta_keys `
 filter. The plugin already includes code to load the revisioned meta for
 previews, see https://github.com/adamsilverstein/wp-post-meta-
 revisions/blob/master/wp-post-meta-revisions.php#L38

 If you have a chance, please give it a try: I will do more testing and
 refreshing of patches on my end soon.

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Ticket URL: <https://core.trac.wordpress.org/ticket/20299#comment:58>
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