Sergey Biryukov efb6e805da Administration: Avoid a PHP 7.4 notice in add_meta_box() when attempting to re-add a previously removed box.
The logic for skipping previously removed meta boxes with the `core` priority should also apply to the `sorted` priority that is used when the boxes were manually reordered.

Add a unit test.

Props coolmann, franzarmas, SergeyBiryukov.
Fixes #50019.

git-svn-id: https://develop.svn.wordpress.org/trunk@47777 602fd350-edb4-49c9-b593-d223f7449a82
2020-05-09 12:24:31 +00:00
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2020-05-04 00:26:52 +00:00