91f04b82a5
Helps most when real-world units are used. Previous code started at the smallest visible unit (e.g. Inches) then followed to Feet, Yards, Chains, Furlongs, Miles. Always to the largest unit of the set, even though most would be way off screen. New code knows whether it skipped any grid lines for the next unit to fill in, can stop once all lines are on screen.