I'm trying to place some holes reasonably precisely, but when I move the
mouse to position (x,y), drop the hole, then look at it with the info button
I find it's invariably shifted a few grid points. I'm fairly sure this is
not just my shaking hand! I'm working around this by increasing the grid
resolution to the point where it's way above the precision I need, but is
there a better way to deal with this?