Gary Pendergast d02d1ea4df Meta Boxes: Add the block_editor_meta_box_hidden_fields action.
Lacking an appropriate action in the classic editor, plugins that add meta boxes have historically hooked into various actions in order to add hidden input fields.

This change also adds backwards compatibility for two of the most common: `edit_form_after_title`, and `edit_form_advanced`.

Props pento, danielbachhuber.
See #45283.



git-svn-id: https://develop.svn.wordpress.org/branches/5.0@43882 602fd350-edb4-49c9-b593-d223f7449a82
2018-11-09 09:05:47 +00:00
2018-10-09 02:51:32 +00:00
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