MacDue 64411127cb LibGfx: Clip edges above or below the visible area in the rasterizer ...

This avoids doing pointless plotting for scanlines that will never be
seen.

Note: This currently can only clip edges vertically. Horizontal clipping
is more tricky, since edges that are not visible can still change how
things accumulate across the scanline.

Fixes #22382

Sadly, this causes a bunch of LibWeb test churn as this change
imperceptibly changes the final rasterized output.

2023-12-24 13:25:40 +01:00

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