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Mike Lang authored
This field changes the option group behaviour depending on its value. Currently only supports two values: "one" (default): Old behaviour, one option can be selected "union": Any number of options can be selected, and the filters are OR-ed togther It is written in such a way as to easily enable a future "intersection" option, as per union but AND-ing the filters. But this is not done here. YAGNI.
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