[wp-trac] [WordPress Trac] #45283: Meta Boxes: Add an action for plugins to print hidden inputs in the meta box form

[WordPress Trac]

#45283: Meta Boxes: Add an action for plugins to print hidden inputs in the meta
box form
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 Reporter:  pento         |      Owner:  pento
     Type:  defect (bug)  |     Status:  assigned
 Priority:  normal        |  Milestone:  5.0
Component:  Editor        |    Version:  5.0
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Some plugins require extra hidden fields to be POSTed to the server when
 meta boxes are saved.

 Historically, these hidden fields have been hooked all over the place. For
 example, ACF uses the `edit_form_after_title` action.

 To consolidate these in the block editor, a new action needs to fire when
 the meta box form is being printed.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45283>
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