[wp-trac] [WordPress Trac] #64049: REST API: Updating comment via REST does not respect allow_empty_comment filter

[WordPress Trac]

#64049: REST API: Updating comment via REST does not respect allow_empty_comment
filter
--------------------------+-----------------------------
 Reporter:  kadamwhite    |      Owner:  kadamwhite
     Type:  defect (bug)  |     Status:  assigned
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  REST API      |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:  rest-api      |
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 When updating a comment via the REST API we currently fail comment updates
 in the `WP_REST_Comments_Controller::update_item` method if the updated
 content is `empty()`. On REST comment creation and within traditional
 comment updates via `wp_handle_comment_submission` we respect the return
 value of the `allow_empty_comment` filter and permit empty comment content
 when this filter is set.

 My understanding of the history here is that allowing empty comments
 permits moderation by allowing inappropriate comment content to be deleted
 without removing the content entity itself; or alternatively (and as
 discussed in #43177) to permit comments to be saved which only contain
 metadata and do not have any "content" in the traditional sense.

 This may also unblock certain actions for editorial comments within the
 block editor.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64049>
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