[wp-trac] [WordPress Trac] #61396: Duplicate terms with different cases with slug transliteration on the pre_insert_term hook

[WordPress Trac]

#61396: Duplicate terms with different cases with slug transliteration on the
pre_insert_term hook
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 Reporter:  oglekler      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Taxonomy      |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 On the /wp-admin/edit-tags.php page, an attempt to add terms `Test` and
 `test` is leading to an error "A term with the name provided already
 exists in this taxonomy." and the term is not added, but if I am doing the
 same thing in Russian language with the usage of a plugin (CyrToLat in
 this case) that is making slug transliteration via the `pre_insert_term`
 filter, I am getting duplicate terms. I am not sure that this issue should
 be addressed to the plugin developer, because it looks like after
 filtering the term, we still need to ensure that this term is valid and
 comply with existing rules.

 @mihdan FYI

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Ticket URL: <https://core.trac.wordpress.org/ticket/61396>
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