wpmu_validate_blog_signup()
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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. git-svn-id: https://develop.svn.wordpress.org/trunk@40295 602fd350-edb4-49c9-b593-d223f7449a82
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