copperwater b4a460f81b Implement selection addition and difference ...

Selection difference is something I have found myself wanting a lot when
working on levels, and have had to defer to a clunkier xor-then-and
approach. This commit implements the TODO-ed addition and subtraction
operators on two sets.

I don't see how the addition operator would be any different from
logical or, so it just calls l_selection_or rather than implement a new
function.

2022-03-14 18:42:28 +02:00

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