GSUB handling is done by a library called a text shaper. Examples of libraries that do shaping include the cross-platform HarfBuzz, Windows DirectWrite, and macOS Core Graphics/Core Text.
So from what I understand these would be called from the UI libraries eg GTK in Linux land. I would assume window managers also, to deal with title bars.
I would further take from this that we shouldn't expect full Unicode support in virtual terminals (not emulators) in the future.....
So from what I understand these would be called from the UI libraries eg GTK in Linux land. I would assume window managers also, to deal with title bars.
I would further take from this that we shouldn't expect full Unicode support in virtual terminals (not emulators) in the future.....