Setting current selection set to difference between its previous objects and popped selection set

The ccm select -not_in_stack command pops the selection set stack, setting the current selection set to the difference between its previous objects and the popped selection set. That is, the new selection set contains objects that were in the previous selection set but not in the popped selection set. For example, if the top of the stack contains objects {a,b,c} and the current selection set contains {b,c,d}, then the current selection set after the command is {d}.

About this task

ccm select -not_in_stack|-not_in

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