Fix issue174 if selection for dragging is not in a previous group, us… #658
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This needs some testing and it seems like the logic could maybe be simpler.
I figured the reason ChooseFromHoverToDrag() exists is to allow dragging entites from previous groups which doesn't happen with ChooseFromHoverToSelect(). If that's the case, we can just check if the drag selection found something from a previous group. If so use it, otherwise use the selection logic for dragging.