Gary Pendergast 1cc2b3f6b6 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.

Merge of [42401,42587,42588] to the 4.9 branch.

Props nickmomrik, frank-klein.
Fixes #15397.



git-svn-id: https://develop.svn.wordpress.org/branches/4.9@42589 602fd350-edb4-49c9-b593-d223f7449a82
2018-01-24 07:11:40 +00:00
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