[wp-trac] [WordPress Trac] #63904: Add action hook when terms counts are updated

[WordPress Trac]

#63904: Add action hook when terms counts are updated
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 Reporter:  LeonidasMilossis  |      Owner:  (none)
     Type:  enhancement       |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Taxonomy          |    Version:  trunk
 Severity:  normal            |   Keywords:
  Focuses:  performance       |
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 With https://core.trac.wordpress.org/ticket/42522 and
 https://core.trac.wordpress.org/ticket/63562 merged and slated for 6.9, we
 have now achieved running the UPDATE queries for updating term counts only
 when we should, which is great.

 What we still lack though is the presence of a dedicated action hook that
 runs only during those operations. The name of that hook could be
 something like `update_term_count`.

 An example where this is needed is something we want to add in Yoast SEO
 where we need to update some database entries of our custom database
 tables and we need to do that only when a term count is updated.
 Considering that we're talking about an extra database query, we want to
 make sure that we only do that when a term count is actually updated and
 not with every update of terms/posts.

 One ''could'' use the `edit_term_taxonomy` action for this, while checking
 for the existence of the `$args` parameter, but this feels hacky and
 having a more canonical and dedicated hook for this probably makes more
 sense.

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Ticket URL: <https://core.trac.wordpress.org/ticket/63904>
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