I can split editor panes horizontally or vertically, but it does not seem possible to view code in two separate physical windows. I am aware that Idea can open multiple projects in separate windows, but I'd like to be able to do this for two files in a single project.
One answer suggested unpinning the tab, but I haven't been able to make that work (I'm on Mac OSX if that matters.)
This seems like a basic feature in today's world of multi-headed workstations. Before moving to an IDE I used to do this regularly with good old Emacs. Is there some trick I am not aware of to make this happen?