I just opened IntelliJ and it has this feature too, where you can "Split right" or "Split down" and have multiple views of the same file. Thanks for letting me know this is something editors might support.

For some reason I have not noticed that feature before. It's not like it is hidden either, as it is in the "right click" context menu that I use daily. I guess I need to learn the tool, so that I don't miss useful features like this.