Proper way to geometrically scale line sketches?
It seems that the current transform/matrix facility scales both the shape itself and the pen. Is there a nice way to scale the geometry of line sketches but maintain line thickness?

If this has to be done manually for now, would a patch that provides pen-preserving transformation be desirable? (I think to do that we need to do calculation in the drawing primitives instead of delegating to the OpenGL side).