Inherited rights from the main wiki not displayed when showing rules for a page on a subwiki

Steps to reproduce:

• on a farm, with multiple subwikis, have page viewer installed on a subwiki
• at the main wiki level, give all rights to a group
• on the subwiki (at the subwiki level), remove all rights rules (or at least clear all rules for one of the rules, e.g. edit)
• go on a page of the subwiki and show the rights with the page rights viewer
• the actual rights display the rights inherited from the main wiki (which are the actual rights that apply)
  • for our example, edit, will appear given to the group that has the right at main wiki level

• click on the top right button to show the detailed rights

Expected result:

• the rules from the main wiki that end up inherited are shown

Actual result:

• the display of the rules "stops" at the subwiki level, the main wiki rules are not shown
  • in our example, there is no rights rule that shows where the edit right given to the group comes from.
• in addition, on the UI, the rules set at the subwiki level are presented as "global rights" which is confusing, because Global is main wiki in the context of a farm.