Boone Gorges 9f0c6cbf8c Disallow post slugs that will result in permalinks that conflict with date archive URLs. ...

On certain permalink structures, a numeric post slug will result in a post
permalink that conflicts with a date archive URL. For example, with permastruct
`/%year%/%monthnum%/%postname%/`, a post published in May 2015 with slug
`'15'` will result in a URL (`/2015/05/15/`) that conflicts with the archive
for May 15, 2015.

To avoid this problem, `wp_unique_post_slug()` rejects a requested slug when it
would generate a conflict of this type. Thus, in our example, `'15'` would
become `'15-2'`.

Props valendesigns, boonebgorges, Denis-de-Bernardy, loushou.
See #5305.
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2015-05-29 12:53:24 +00:00

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