Trevor tweaked the pixel grid snapping on my previous commit
but it appears that introduced some errors as well. The horizontal
lines in underline-a and strikethrough-s no longer have integer
x-coordinates, and on underline-u the whole object is offset
by (0.166, 0.166).
Bug: 47780
Change-Id: I51f2605e7d8e2bab1d641f02244d5cd24f505676