I'd considered adding at least a low-level preference to disable box-drawing overrides, and I still might. With the overrides though, you do not have to instal

I'd considered adding at least a low-level preference to disable box-drawing overrides, and I still might. With the overrides though, you do not have to install any particular font to have accurate line-drawing, and you can see lines even when choosing a font that might not otherwise be designed for line-drawing.