[wp-trac] [WordPress Trac] #18752: Allow category preference in permalinks

[WordPress Trac]

#18752: Allow category preference in permalinks
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 Reporter:  aaroncampbell  |       Owner:
     Type:  defect (bug)   |      Status:  new
 Priority:  normal         |   Milestone:  Awaiting Review
Component:  General        |     Version:  3.2
 Severity:  normal         |  Resolution:
 Keywords:  has-patch      |
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Comment (by aaroncampbell):

 It has the potential to change exiting permalinks but only if someone
 specifically writes code (like in my comment above) to do that.  If they
 *do* then as nacin said, the new permalink will match the canonical URL.
 However, URLs changed in this way will NOT get redirected with
 `redirect_canonical()` because when it deals with `%category%` it checks
 if the cat in the current URL is valid for the post and if it is it
 doesn't try to redirect.  Since the previous category would be valid (even
 if not preferred) it would not redirect.  However, this is consistent with
 what happens currently (if a post is in 3 categories it has three URLs
 that will work and not redirect, but only one that is canonical), and you
 could force a redirect with your own function hooking into
 `template_redirect` for these situations.

 Having had the chance to test it a lot more today...it's working really
 well for my use cases.

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Ticket URL: <http://core.trac.wordpress.org/ticket/18752#comment:9>
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