This turns out to be a bug under very special conditons:
A line does not fit due to it's height. Fitting the line with a larger height breaks the line into multiple chunks. Nothing fits into the first chunk which causes the line height to be reset to the initial too small height. Repeat.
This turns out to be a bug under very special conditons:
A line does not fit due to it's height. Fitting the line with a larger height breaks the line into multiple chunks. Nothing fits into the first chunk which causes the line height to be reset to the initial too small height. Repeat.
Fixed in trunk.