Merging popped selection set with current selection set

The ccm select -union command pops the selection set stack, merging the popped selection set with the current selection set. 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 {b,c,d,a}.

About this task

ccm select -un|-union

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