FA-50514 / Raster clipping / Member archive

Clip mask cache: disabled cache result · case 04

Drawing with clipping disabled still uses cached coverage.

Member previewVariant 4 · 3 implementations · 9 checks per implementation

Case contract

Cache entries store copied coverage and source revisions. Draw recomputes after mask edits. Disable returns full coverage without overwriting cached mask. Rebinding to another name cannot reuse the old name; clearing definitions removes stale entries. Missing definitions clip empty.

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	`[[0], [0], [0]]`	`[[0], [0, 1, 2, 3, 4, 5, 6], [0]]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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