experimental fix for compatibility mode. When we scale up by 1.5 (240 dpi), we...

experimental fix for compatibility mode. When we scale up by 1.5 (240 dpi), we put stretched ninepatches on
exact pixel boundaries when we walk the inverse matrix (e.g. 2/3, 1+1/3, 2, 2+2/3, 3+1/3, 4, ...).

These are not stable, since any variance in the inverse matrix (even in the lowest bit) can cause some other
part of the ninepatch to start a hair to the left, resulting in misaligning every 3 pixels.

The fix changes the matrix' phase enough to keep all of the stretched ninepatches in phase.