- // First, get the list of groups that can edit this namespace.
- $namespaceGroups = [];
- $combine = 'array_merge';
+ // $wgNamespaceProtection can require one or more rights to edit the namespace, which
+ // may be satisfied by membership in multiple groups each giving a subset of those rights.
+ // A restriction level is redundant if, for any one of the namespace rights, all groups
+ // giving that right also give the restriction level's right. Or, conversely, a
+ // restriction level is not redundant if, for every namespace right, there's at least one
+ // group giving that right without the restriction level's right.
+ //
+ // First, for each right, get a list of groups with that right.
+ $namespaceRightGroups = [];