Peter Wilson f2779be7f0 Roles/Caps: Return same result from current_user_can and user_can().
Ensure `current_user_can()` and `user_can()` return the same results for logged out users. For core capabilities this changes `user_can( 0, 'exist' )` to return `true` rather than `false` in line with `current_user_can( 'exist' )` for logged out users.

Convert `current_user_can()` and `current_user_can_for_blog()` to wrapper functions ultimately calling `user_can()`.

Add anonymous user to primitive capability checks as appropriate. Convert `Tests_User_Capabilities::test_other_caps_for_all_roles()` to use a data provider and add tests to check whether user exists in the database (`WP_User::exists()`) as that intentionally differs from the `exist` capability.

Props jjj, johnbillion, peterwilsoncc, SergeyBiryukov, TimothyBlynJacobs.
Fixes #52076.



git-svn-id: https://develop.svn.wordpress.org/trunk@50490 602fd350-edb4-49c9-b593-d223f7449a82
2021-03-04 00:12:55 +00:00
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2020-06-26 13:31:11 +00:00