328de7115a
When updating an existing taxonomy term that shares its `term_id` with another term, we generate a new row in `wp_terms` and associate the updated term_taxonomy_id with the new term. This separates the terms, such that updating the name of one term does not change the name of any others. Note that this term splitting only occurs on installations whose database schemas have been upgraded to version 30133 or higher. Note also that shared terms are only split when run through `wp_update_term()`, as on edit-tags.php; we will wait until a future release of WordPress to force the splitting of all shared taxonomy terms. Props boonebgorges, rmccue, greuben, garyc40, wonderboymusic, imath, jesin. Fixes #5809. git-svn-id: https://develop.svn.wordpress.org/trunk@30241 602fd350-edb4-49c9-b593-d223f7449a82