FA-50490 / Raster clipping / Member archive

Named mask registry: redefine union · case 05

Redefining a mask retains samples from its previous version.

Member previewVariant 5 · 3 implementations · 12 checks per implementation

Case contract

Named clip masks are immutable snapshots clipped to target extent. Bind selects a name, edits replace the named mask, deletion of the active mask makes drawing empty. Renaming preserves active binding; clone is independent; reset clears registry and active binding.

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 7	`[[0, 2]]`	`[[2]]`	Failed

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