Gary Pendergast c07972d774 Canonical URLs: Redirect to the correct URL when the post date changes.
When a post slug is changed, we store a copy of the old slug, so that we can redirect visitors visiting the old URL to the new URL.

In the same way, this stores a copy of the old date, when the post date changes, so we can redirect visitors to the new URL.

Props nickmomrik.
Fixes #15397 for trunk.



git-svn-id: https://develop.svn.wordpress.org/trunk@42401 602fd350-edb4-49c9-b593-d223f7449a82
2017-12-15 08:30:50 +00:00
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