[wp-trac] [WordPress Trac] #42999: A Super Admin can have no caps on a /wp/v2/users/me?context=edit REST API request

[WordPress Trac]

#42999: A Super Admin can have no caps on a /wp/v2/users/me?context=edit REST API
request
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 Reporter:  imath         |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  REST API      |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:  multisite     |
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 Hi,

 When testing Gutenberg, as it uses the REST API
 `/wp/v2/users/me?context=edit` request to get the current user
 capabilities I've noticed this request can return an empty object for the
 user's capabilities although the current user is a Super Administrator.

 Steps to reproduce in a multisite config:
 1. log as a super administrator.
 2. create a new user from the network administration.
 3. create a new site for this created user.
 4. Request `/wp/v2/users/me?context=edit` on the newly created site.

 I think even if a Super Admin has no role on a given site, as he can
 actually perform all the site's administrator actions, the site's
 `/wp/v2/users/me?context=edit` request should return the administrator's
 capabilities for this Super Admin.

 I'm attaching a diff containing my suggestion to fix what i think is an
 issue + a unit test.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42999>
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