workinf_Blender_Wasm/docs/status/M16-GAP-00021.md

M16-GAP-00021 Status

status: done task: Screen data-block LOCAL_EXACT slice updated: 2026-08-19 America/New_York

scope: Blender 5.2 bScreen identity and bounded editor layout observability through the linked editor workflow: four areas, editor types and regions.

evidence:

• tools/web/generated/M16-GAP-00021.py renamed the factory startup screen to WebGapScreen, preserving its deterministic four-area layout.
• Desktop report reopened after save and matched exactly: screen:WebGapScreen, four areas, VIEW_3D, OUTLINER, PROPERTIES, DOPESHEET_EDITOR, and 18 regions.
• WASM/Main opened the same fixture with editor workflow available, matched the corresponding workspace area/editor set and save/reopen matched the complete workflow exactly.
• A truncated malformed Blend submitted to an already loaded Main was rejected and the original snapshot remained unchanged.
• build_blender_5.2.0/bin/blender -b --factory-startup --python tools/web/generated/M16-GAP-00021.py -- tests/files/web/generated/M16-GAP-00021-datablock-Screen.blend exited 0.
• npm --prefix web run test:generated-gap -- --task M16-GAP-00021 exited 0.
• node tools/web/check-generated-gap.mjs --task M16-GAP-00021 exited 0.

artifacts: tests/golden/M16-GAP-00021/manifest.json contains SHA-256 for the parent manifest, fixture, generator, desktop/Web checkers, reader/protocol/runtime and both reports.

knownRisk: This closes one datablock:Screen layout-observability slice only. Editor operations, workspace mutation and all other generated gaps remain separate tasks.

rollback: remove this task's fixture, generator, checker branch, reports, manifest, status and context; restore M16-GAP-00020 as the queue tail without editing its successful evidence.

nextTask: M16-GAP-00022