[wp-trac] [WordPress Trac] #35031: wp_old_slug_redirect() in 4.4 redirecting existing posts

[WordPress Trac]

#35031: wp_old_slug_redirect() in 4.4 redirecting existing posts
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 Reporter:  douglsmith                           |       Owner:  pento
     Type:  defect (bug)                         |      Status:  assigned
 Priority:  normal                               |   Milestone:  4.4.1
Component:  Query                                |     Version:  4.4
 Severity:  critical                             |  Resolution:
 Keywords:  has-patch needs-unit-tests needs-    |     Focuses:
  testing                                        |
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Comment (by pento):

 This is so that old links don't break, if the slug is changed.

 For example:

 * The owner of example.com posts example.com/my-psot/
 * That post is linked to from Reddit, giving them lots of traffic.
 * They realise there's a typo in the slug! They want to rename it, but
 they don't want their visitors to get a 404.
 * When they rename it, WordPress stores the old slug in `_wp_old_slug`. If
 people try to visit the old URL, they'll be quietly redirected to the new
 one.

 This behaviour has existed in WordPress since 2.1. The bug in this ticket
 is if a post slug is changed, then a new post is created with the old
 slug, it still redirects, instead of stopping at the new post.

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Ticket URL: <https://core.trac.wordpress.org/ticket/35031#comment:20>
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