Where one body stands on another (a post on a plate), the post's bottom,
seen through the cut, and the plate's top are the same plane. In the CPU
rasterizer (headless pictures without a GPU) the plate's top won that
depth tie and showed through the post's cut. The cut now wins a tie by a
few f32 steps (DEPTH_EPS).
The viewport already draws this right since #6363 and #6728; a GPU
regression test now covers it, both creation orders, orthographic and
perspective, with both depth formats.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
SS-ENandClaude Opus 5.5
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