[wp-trac] [WordPress Trac] #37156: Multisite: WP-generated permalink for title-less post does not work (Or: numeric post slug that matches existing post ID number generates 404 error)

[WordPress Trac]

#37156: Multisite: WP-generated permalink for title-less post does not work (Or:
numeric post slug that matches existing post ID number generates 404 error)
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 Reporter:  raskull       |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  4.4.3
 Severity:  normal        |   Keywords:
  Focuses:  multisite     |
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 On a Multisite installation, a permalink with a post-name structure
 results in a 404 error when its slug is a number and that number matches
 an existing post ID number. Example: http://myblog.com/blog/7 where a post
 (any post) has an ID of 7.

 When WordPress generates a slug for a title-less post, it forms the slug
 using the post ID. Since the post ID is (now) in use, the default
 permalink for the title-less post is broken.

 It appears ticket #5305 resolved the issue for regular installs by
 automatically appending -2 to the slug (http://myblog.com/blog/7-2). Can
 this be done for Multisite? Or better yet, use some other more elegant
 designation that doesn't imply that this is the second of two posts using
 7 for the slug?

 To replicate:
 Use a Multisite installation.
 Set permalinks to Post name structure.
 Create a post without a title.
 Note that the generated slug is the ID number of the post.
 Save and then click on the Permalink slug below the title text field.
 Arrive at 404 page.
 In admin, change the slug to include a character.
 Try again.
 Arrive at correct page.

 You can also see the same behavior by choosing any titled post in admin
 and changing its slug to a number that matches its own or any other
 existing ID.

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Ticket URL: <https://core.trac.wordpress.org/ticket/37156>
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