K. Adam White 5f9ba92af4 REST API: Skip processing fields which are not present in the selected context.
In `WP_REST_Controller::get_fields_for_response()`, exclude fields which are not registered to appear in the request's context.

In conjunction with r45705 this prevents the unnecessary computation of the sample permalink when making a request that is not context=edit.

Props dlh.
Fixes #45605.

Built from https://develop.svn.wordpress.org/trunk@45706


git-svn-id: http://core.svn.wordpress.org/trunk@45517 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-07-31 20:21:56 +00:00
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