I read up that issues sometimes occur with a too low start clipping distance, and since the model I'm working on is pretty huge, I set the start clipping to 1 blender unit. However, I noticed that the edges in edit mode became dashed after doing this:
However, from straight down instead of a grazing angle, it looks normal, even with the high start clipping:
And, just for comparison, here's what it looks like with a start clipping of 0.01:
I'm completely fine just using the lowered start clipping, since I can't see any artifacts, but I'm still curious as to why this happens?