I’m running Atom 1.9.0 on the Mac. I have an editor window open with some files in tabs. I select some files in the Finder and drag them on to the application icon. I would prefer them to open in a new window, but they’re added to an existing window.
I then close them again, and create a new window for them to go in, and drag the files on to this new window. But, annoyingly, the focus switches back to the old window, and they’re opened there instead.