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Fix bad postdecrement of NodeSet iterator

John Ellson requested to merge gh-c0f8120a/58/pixelglow/fix-crash-in-generate-constraints into master

Created by: pixelglow

When scanline.find(v) finds the first scanline, the tests decrement the iterator before the first scanline, which is an invalid position and causes a crash in OS X / iOS libc++. The fix doesn't decrement the iterator if it is already at the beginning.

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