Found and squashed the bug. A variable needed to be reinitialized every
time though a loop.

The first time through the loop the var had the value +foo.
Then it was evaluated to add the foo user to nosy and
the value was changed to exact value demo,foo (assuming demo
was the original nosy value for the first item designator). Then the
exact value got used to set the rest of the designators.

By resetting the variable to +foo for every designator it magically
works the way it was intended.

checked in: ca3e56590fcd