list(FILTER PREDICATE)

This Discourse thread brought up that a list(FILTER <listvar> PREDICATE "args for if()") would be useful. We'd need to determine a variable name for the element to have in the evaluation of the predicate. Some if() predicates do require expanded strings, so something like list(FILTER potential_targets PREDICATE "TARGET item") would need some consideration. Maybe PREDICATE "TARGET @item@" and do a string(CONFIGURE) pass on it would suffice?

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