Isolate : Fix filter match combination bug
Isolate : Fix filter match combination bug

It's a bitmask, so we need to use bitwise or. I _think_ we were still getting correct results with the buggy code, but weren't hitting the pruning optimisation for `ExactMatch | AncestorMatch`.

boberfly/gaffer,appleseedhq/gaffer,GafferHQ/gaffer,boberfly/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,ImageEngine/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,hradec/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,hradec/gaffer,ImageEngine/gaffer,ImageEngine/gaffer,appleseedhq/gaffer,boberfly/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,hradec/gaffer,appleseedhq/gaffer,boberfly/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,hradec/gaffer,hradec/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer