[wp-trac] [WordPress Trac] #60532: Add a `pre_set_object_terms` action

[WordPress Trac]

#60532: Add a `pre_set_object_terms` action
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 Reporter:  davidbaumwald  |      Owner:  (none)
     Type:  enhancement    |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Taxonomy       |    Version:  trunk
 Severity:  normal         |   Keywords:
  Focuses:                 |
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 Working with some custom terms & taxonomies, and it looks like there's no
 way to hook in to `wp_set_object_terms` _before_ the terms are updated.

 In the end, the `$old_tt_ids` is passed to the `set_object_terms`
 action(added in r12261).  But, these are the `term_taxonomy_id`s and a a
 bit harder to work with than the plain terms.  Also, these are provided
 _after_ the terms are updated.  So, there's no way to short-circuit the
 updating.

 However, I think it would be useful to have a `pre_` action that can work
 on the current terms before commiting the changes.

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Ticket URL: <https://core.trac.wordpress.org/ticket/60532>
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