I'm using blender 2.79. As far as I can recall, this didn't happen while I used 2.78.
I've been getting intermittent graphical glitches in solid view in both sculpt and edit mode, usually when changing the viewport (especially zooming in and out) but it generally only lasts for one frame so I never had a chance to document it until now. It's happened in multiple files on multiple systems (laptop and desktop, both Windows).
The visual triangles always match with the tris of the model, and it's always this color scheme or black and white. The colors never seen to match any pattern- normals, materials, etc- is this a generalized blender glitch that other people have found, or could this be caused by insufficient graphics drivers...?