Tonya Mork dc3204ec1d REST API: Fixes /wp/v2/pattern-directory/patterns endpoint response for slug parameter.
[53218] introduced a bug of a wrong response from the `wp/v2/pattern-directory/patterns` endpoint with a `slug` parameter. As the response is cached, it can result in an incorrect list of available patterns supported by the current theme.

This commit resolves by:

* Limiting the `slug` to an `array` in the query parameters.
* When set, parsing and sorting the slug(s) and then serializing the sorted query args as part of the hashed transient keys.

Props antonvlasenko, timothyblynjacobs, spacedmonkey, costdev, hellofromTonya.

Follow-up to [53218], [53152], [51208].
Fixes #55617.

git-svn-id: https://develop.svn.wordpress.org/trunk@53333 602fd350-edb4-49c9-b593-d223f7449a82
2022-05-02 13:58:48 +00:00
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