desrosj 7523e1376b Widgets: Use wp_sidebar_description() to retrieve a sidebar’s description.
This switches `WP_REST_Sidebars_Controller` to use `wp_sidebar_description()` for retrieving the description of a given sidebar instead of referencing the value in the `$wp_registered_sidebars` global variable directly.

`wp_sidebar_description()` uses `wp_kses()` to only allow the default list of `$allowed_tags` to be present in a sidebar’s description.

Props timothyblynjacobs, desrosj, SergeyBiryukov.
Merges [51408] to the 5.8 branch.
Fixes #53646.
Built from https://develop.svn.wordpress.org/branches/5.8@51412


git-svn-id: http://core.svn.wordpress.org/branches/5.8@51023 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2021-07-13 00:10:58 +00:00
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