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

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

About this task

ccm select -symdiff

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