Modeling bend in face with slot

[lorenzncode]

The solution of #1996 does not preserve the slot. It looks like a different approach is needed to create a bend given a face with features such as slot/holes.

from cadquery import Sketch

sk1 = Sketch().rect(40, 20).push([(-10, 0)]).slot(10, 1, 0, "s").reset()

BEND_RADIUS = 1
THICKNESS = 1

# todo:
# - create bend at x=-10, around y, say -90 degrees
# - thicken/offset to given thickness 

[adam-urbanczyk]

I think the best angle of attack here would be to use edgeOn and map the original sketch onto the parametric space of the bent plate.