(21-08-2017, 09:41 PM)Tmplt Wrote: So: is there some X11 utility that can scale a window up to a greater resolution, and thus remove the pesky black bars?

You can make the window bigger but if the application "drawing" on it isn't aware of the size change then it's going to keep "drawing" at the same size. If you make the window bigger you'll still have those "black/empty" colors around it.

Some window managers respect the ICCCM default size of the window, be it minimum size of maximum size, etc.. Others don't.

Maybe a compositor "magnifying/zooking" tool exists. I'll try to look for one.
EDIT: Here are some
https://packages.debian.org/sid/x11/xzoom
http://magnifier.sourceforge.net/
https://www.kde.org/applications/utilities/kmag/
Compiz has a nice way to zoom in: https://askubuntu.com/questions/164820/d...-magnifier