Jake Spurlock 95b9933e64 Administration: Update WP_List_Table::get_sortable_columns() to support asc and desc arguments.
This makes the API a little more clear, whereas setting `false` used to mean `asc` and `true` meant `desc`, you can now use those directly, while maintaining back-compat.

Fixes #45089.

Props Tkama, SergeyBiryukov, shital-patel, desrosj, birgire, davidbaumwald. 



git-svn-id: https://develop.svn.wordpress.org/trunk@48151 602fd350-edb4-49c9-b593-d223f7449a82
2020-06-23 23:13:35 +00:00
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