[wp-trac] [WordPress Trac] #37616: Replace `is_super_admin()` calls with real capability checks

[WordPress Trac]

#37616: Replace `is_super_admin()` calls with real capability checks
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 Reporter:  flixos90         |       Owner:
     Type:  task (blessed)   |      Status:  reviewing
 Priority:  normal           |   Milestone:  4.8
Component:  Role/Capability  |     Version:
 Severity:  normal           |  Resolution:
 Keywords:  needs-patch      |     Focuses:  multisite
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Comment (by flixos90):

 In [changeset:"40295"]:
 {{{
 #!CommitTicketReference repository="" revision="40295"
 Multisite: Remove restriction of minimum site name length in
 `wpmu_validate_blog_signup()`.

 It is sometimes desirable to support shorter site names than 4 characters,
 therefore that restriction should be removed. It is still possible to
 manually enforce it by using the `wpmu_validate_blog_signup` filter.

 As a result of this change, another `is_super_admin()` call gets removed
 which affects the ongoing efforts of working on a network-wide role
 system.

 Props milindmore22.
 Fixes #39676. See #37616.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/37616#comment:58>
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