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`wp_unique_term_slug()` appends numeric suffixes when the requested slug is already in use by a sibling term. Changes introduced in [32837] inadvertently caused this suffixing to be skipped in cases where the requested slug is suffixed with the parent slug, so that it became possible to have two terms `childslug-parentslug` underneath to the same `parentslug`. We fix this regression by ensuring that the numeric-suffix routine runs in all cases. Props yashar_hv, saskak, dlh. Fixes #46431. git-svn-id: https://develop.svn.wordpress.org/trunk@45893 602fd350-edb4-49c9-b593-d223f7449a82