John Blackbourn 32d38fc080 Introduce some actions and filters which aid plugins in revisioning post meta.
* `wp_save_post_revision_post_has_changed` filter which can be used to determine if a post has been changed, and therefore if a revision should be created for a post.
 * `wp_get_revision_ui_diff` filter which can be used to filter the fields displayed in the post revision diff UI.
 * `wp_creating_autosave` action which is fired just before an autosave is created.

See #20564.
Props mattheu, adamsilverstein.


git-svn-id: https://develop.svn.wordpress.org/trunk@30091 602fd350-edb4-49c9-b593-d223f7449a82
2014-10-29 19:01:15 +00:00
2014-08-21 02:53:16 +00:00
2014-10-28 20:44:33 +00:00
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