Comment 8 for bug 1391857

Created attachment 104383
quick hack

The problem here seems to be that with small areas to fill
the boxes tessellator receives empty boxes which are
evidently unexpected. The attached patch is derived going
one step back to the source of these empty boxes,
a comment there seems to imply a choice to mimic pixman.

Obviously the real problem could be earlier than there.

A different solution could be to impose a minimum 1 width/height
for the boxes generated.