Advance M8-M11 parity workflows

tools/web/generate-grease-pencil-reorder-golden.py

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+import hashlib
+import json
+import os
+import sys
+import tempfile
+
+import bpy
+
+
+def layer_state(grease_pencil):
+    return {
+        "layerOrder": [layer.name for layer in grease_pencil.layers],
+        "framesByLayer": {
+            layer.name: sorted(frame.frame_number for frame in layer.frames)
+            for layer in grease_pencil.layers
+        },
+    }
+
+
+def main():
+    arguments = sys.argv[sys.argv.index("--") + 1 :] if "--" in sys.argv else []
+    if len(arguments) != 2:
+        raise SystemExit("usage: blender -b fixture.blend --python generate-grease-pencil-reorder-golden.py -- fixture.blend output.json")
+    fixture = os.path.abspath(arguments[0])
+    output = os.path.abspath(arguments[1])
+    grease_pencil = bpy.data.grease_pencils.get("GreasePencilData")
+    if grease_pencil is None or len(grease_pencil.layers) != 1:
+        raise RuntimeError("GreasePencilData fixture must contain exactly one source layer")
+
+    source = layer_state(grease_pencil)
+    layer = grease_pencil.layers.new("Web Drafts", set_active=True)
+    layer.frames.new(1)
+    before = layer_state(grease_pencil)
+    grease_pencil.layers.move(layer, "DOWN")
+    moved = layer.frames.move(1, 12)
+    if moved is None:
+        raise RuntimeError("Blender refused the Grease Pencil frame move")
+    after = layer_state(grease_pencil)
+
+    with tempfile.TemporaryDirectory(prefix="m9-08-grease-pencil-reorder-") as temporary:
+        saved = os.path.join(temporary, "grease-pencil-reorder.blend")
+        bpy.ops.wm.save_as_mainfile(filepath=saved, check_existing=False)
+        bpy.ops.wm.open_mainfile(filepath=saved)
+        reopened = layer_state(bpy.data.grease_pencils["GreasePencilData"])
+
+    with open(fixture, "rb") as source_file:
+        fixture_sha256 = hashlib.sha256(source_file.read()).hexdigest()
+    payload = {
+        "schemaVersion": 1,
+        "fixture": "tests/files/web/modifier_grease_pencil_scene.blend",
+        "fixtureSha256": fixture_sha256,
+        "blenderVersion": ".".join(str(value) for value in bpy.app.version),
+        "greasePencilName": "GreasePencilData",
+        "source": source,
+        "beforeReorder": before,
+        "afterReorder": after,
+        "reopened": reopened,
+    }
+    with open(output, "w", encoding="utf-8") as destination:
+        json.dump(payload, destination, indent=2, sort_keys=True)
+        destination.write("\n")
+
+
+if __name__ == "__main__":
+    main()