Hi,

at the moment, endless sky only utilizes one window/screen. I could imagine using a second/third screen or window as well, e.g., for something like a status indication, e.g. a star map or whatever. I know that this might be some larger undertaking, so before even trying an ugly proof-of-concept prototype I better ask: has something like that chances to actually be included upstream?

One of the first things one likely would need to to is to decouple within GameWindow global things (like SDL initialization) from window-specific things (like window sizes; fullscreen settings); which includes moving some of the current class-storage to instance-storage (at the moment the game assumes that there is only one instance of this class). I don't currently see an issue doing this, but it would be nice to do cleanups like these in steps and get them into main in steps, and not having to put everything at once in one large PR in the end; because technically this is a cleanup that might as well happen on main even without multiple windows later. Has this a chance of happening?