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Expanding a pending range by a rectangle starting below its start added a negative row count to an unsigned height, which wrapped to millions of rows. Overlap tests then overflowed and missed real overlaps. Now a merged range is whole rows from the lower start to the higher end. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
To get to 100% compatibility, we will need a software renderer as there are games out there that do tricks that can't really be faked in a sensible way. Useful for homebrew too that mix sw and accel rendering.