Alexei Podtelezhnikov 816516360c [smooth] Fix complex rendering at high ppem.
We used to split large glyphs into horizontal bands and continue
bisecting them still horizontally if that was not enough.  This is
guaranteed to fail when a single scanline cannot fit into the
rendering memory pool.  Now we bisect the bands vertically so that
the smallest unit is a column of the band height, which is guranteed
to fit into memory.

* src/smooth/ftgrays.c (gray_convert_glyph): Implement it.
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