FA-50703 / Raster clipping / Member archive

Layer clip isolation: clear clip · case 03

Clearing a layer also clears its clipping region, preventing subsequent draws.

Member previewVariant 3 · 3 implementations · 16 checks per implementation

Case contract

A layer captures the parent clip and starts with its own full local clip. Child drawing accumulates coverage in that layer; layer completion intersects child coverage with the saved parent clip. Discard removes the layer without publishing. A layer-local clear erases only its accumulated coverage. Parent clip edits after opening cannot change the captured parent clip.

Why this case matters

Raster clip state can leak coverage across draws even when every individual region is valid.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
explicit sequence 4	`[[]]`	`[[1]]`	Failed

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