Containers generally have a smaller UID range assigned than host systems. Let's visualize this in the user/group tables. We insert markers for unavailable regions. This way display is identical to status quo ante on host systems, but in containers unavailable ranges will be shown as that. And while we are at it, also hide well-known UID ranges when they are outside of userns uid_map range. This is mostly about the "container" range. It's pointless showing the cotnainer range (i.e. a range UID > 65535) if that range isn#t available in the container anyway.
System and Service Manager
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