One corner of my room is a 45-degree angle. How do I constrain the interior length of that wall? I have used TAB to select the corner points of the wall, instead of the wall face, and I've tried both Aligned and Linear dimensions with both Linear and Diagonal styles, but every time I end up with a horizontal or vertical dimension, not one that's parallel to the wall.
I've been able to create detail lines that are perpendicular to the wall, but of course constraining those has no effect on the wall itself.