Item8877: new groups UI (WikiGroups topic) isn't really helpful if the a user that is in the list to add doesn't actually exist.
Priority: Normal
Current State: No Action Required
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Applies To: Engine
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it should probly say on the topic that the user must exist, and on the error output that the user does not
and in 2.0 we should look at pre-validating the list of users to add...
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SvenDowideit - 10 Apr 2010
It was decided that in some enterprise environments, it is correct to be able to add users to groups before they exist. The groups UI no longer enforces that users must exist.
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GeorgeClark - 13 Mar 2011