Boone Gorges 0ae22e5f4c In delete_metadata(), only invalidate cache for affected objects.
The `$delete_all` flag in `delete_metadata()` triggers cache invalidation for
multiple objects. Previously, invalidation took place for all objects matching
the `$meta_key` parameter, regardless of whether `$meta_value` was also set.
This resulted in overly aggressive invalidation.

Props rahal.aboulfeth.
Fixes #35797.

git-svn-id: https://develop.svn.wordpress.org/trunk@36511 602fd350-edb4-49c9-b593-d223f7449a82
2016-02-12 02:46:28 +00:00
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