Re-home the layer-path stamp and switch the node path to its plain value form

editor/src/messages/portfolio/document/data_panel/data_panel_message_handler.rs

@@ -180,6 +180,11 @@ fn generate_layout(introspected_data: &Arc<dyn std::any::Any + Send + Sync + 'st
 	if let Some(list) = introspected_data.downcast_ref::<List<NodeId>>() {
 		return Some(table_node_id_path_layout_with_breadcrumb(list, data));
 	}
+	// The path's plain value form, produced by `path_of_subgraph` on leveled wires.
+	if let Some(path) = introspected_data.downcast_ref::<Vec<NodeId>>() {
+		let list: List<NodeId> = path.iter().copied().map(graphene_std::list::Item::new_from_element).collect();
+		return Some(table_node_id_path_layout_with_breadcrumb(&list, data));
+	}
 	generate_layout_downcast!(introspected_data, data, [
 		List<Artboard>,
 		List<Graphic>,
@@ -1011,6 +1016,11 @@ fn drilldown_attribute_layout(any: &dyn Any, data: &mut LayoutData) -> Option<Ve
 	if let Some(path) = any.downcast_ref::<List<NodeId>>() {
 		return Some(table_node_id_path_layout_with_breadcrumb(path, data));
 	}
+	// The path's plain value form, the layer-path marker's owned shape.
+	if let Some(path) = any.downcast_ref::<Vec<NodeId>>() {
+		let list: List<NodeId> = path.iter().copied().map(graphene_std::list::Item::new_from_element).collect();
+		return Some(table_node_id_path_layout_with_breadcrumb(&list, data));
+	}
 	macro_rules! check {
 		( $($ty:ty),* $(,)? ) => {
 			$(

node-graph/graph-craft/src/document.rs

@@ -221,7 +221,7 @@ pub enum DocumentNodeMetadata {
 impl DocumentNodeMetadata {
 	pub fn ty(&self) -> Type {
 		match self {
-			DocumentNodeMetadata::DocumentNodePath => concrete!(core_types::list::List<NodeId>),
+			DocumentNodeMetadata::DocumentNodePath => concrete!(Vec<NodeId>),
 			DocumentNodeMetadata::SourceId => concrete!(u64),
 		}
 	}

node-graph/graph-craft/src/document/value.rs

@@ -174,10 +174,7 @@ macro_rules! tagged_value {
 					// NON-SERIALIZED VARIANTS
 					// =======================
 					Self::RenderOutput(x) => Box::new(x),
-					Self::NodeIdPath(path) => {
+					Self::NodeIdPath(path) => Box::new(path),
-						let list: List<NodeId> = path.into_iter().map(core_types::list::Item::new_from_element).collect();
-						Box::new(list)
-					}
 					Self::DocumentNode(node) => Box::new(node),
 					Self::ContextModification(modification) => Box::new(modification),
 					Self::EditorApi(x) => Box::new(x),
@@ -224,10 +221,7 @@ macro_rules! tagged_value {
 					// NON-SERIALIZED VARIANTS
 					// =======================
 					Self::RenderOutput(x) => Arc::new(x),
-					Self::NodeIdPath(path) => {
+					Self::NodeIdPath(path) => Arc::new(path),
-						let list: List<NodeId> = path.into_iter().map(core_types::list::Item::new_from_element).collect();
-						Arc::new(list)
-					}
 					Self::DocumentNode(node) => Arc::new(node),
 					Self::ContextModification(modification) => Arc::new(modification),
 					Self::EditorApi(x) => Arc::new(x),
@@ -255,7 +249,7 @@ macro_rules! tagged_value {
 					// NON-SERIALIZED VARIANTS
 					// =======================
 					Self::RenderOutput(_) => concrete!(RenderOutput),
-					Self::NodeIdPath(_) => concrete!(List<NodeId>),
+					Self::NodeIdPath(_) => concrete!(Vec<NodeId>),
 					Self::DocumentNode(_) => concrete!(DocumentNode),
 					Self::ContextModification(_) => concrete!(ContextModification),
 					Self::EditorApi(_) => concrete!(Arc<PlatformEditorApi>),
@@ -283,7 +277,7 @@ macro_rules! tagged_value {
 					Self::BrushStrokes(_) => core_types::record::element_write::<List<BrushStroke>>(),
 					$( Self::$identifier(_) => core_types::record::element_write::<$ty>(), )*
 					Self::RenderOutput(_) => core_types::record::element_write::<RenderOutput>(),
-					Self::NodeIdPath(_) => core_types::record::element_write::<List<NodeId>>(),
+					Self::NodeIdPath(_) => core_types::record::element_write::<Vec<NodeId>>(),
 					Self::DocumentNode(_) => core_types::record::element_write::<DocumentNode>(),
 					Self::ContextModification(_) => core_types::record::element_write::<ContextModification>(),
 					Self::EditorApi(_) => core_types::record::element_write::<Arc<PlatformEditorApi>>(),
@@ -330,10 +324,7 @@ macro_rules! tagged_value {
 					// NON-SERIALIZED VARIANTS
 					// =======================
 					Self::RenderOutput(x) => Ok(record_value_edge(x)),
-					Self::NodeIdPath(path) => {
+					Self::NodeIdPath(path) => Ok(record_value_edge(path)),
-						let list: List<NodeId> = path.into_iter().map(core_types::list::Item::new_from_element).collect();
-						Ok(record_value_edge(list))
-					}
 					Self::DocumentNode(node) => Ok(record_value_edge(node)),
 					Self::ContextModification(modification) => Ok(record_value_edge(modification)),
 					Self::EditorApi(x) => Ok(record_value_edge(x)),
@@ -623,7 +614,6 @@ impl TaggedValue {
 			Self::Color(color) => Ok(leveled_record_value_edge(color.into_iter().collect::<Vec<_>>())),
 			Self::Gradient(stops) => Ok(leveled_record_value_edge(vec![stops])),
 			Self::BrushStrokes(strokes) => Ok(leveled_record_value_edge(strokes)),
-			Self::NodeIdPath(path) => Ok(leveled_record_value_edge(path)),
 			other => other.to_edge(),
 		}
 	}

node-graph/nodes/graphic/src/graphic.rs

@@ -1,4 +1,4 @@
-use core_types::attribute::{Attr, Transform as TransformAttr};
+use core_types::attribute::{Attr, EditorLayerPath, Transform as TransformAttr};
 use core_types::bounds::{BoundingBox, RenderBoundingBox};
 use core_types::extent::{ExtentIn, LevelIn, ListIn, ValueIn};
 use core_types::gpoll::{Extent, GPoll, GraphError, Interrupt, Level};
@@ -204,11 +204,22 @@ where
 /// editor tools (e.g. selection, click target routing) trace data back to its owning layer regardless of whether
 /// the layer is at the root document network or nested inside a custom subgraph.
 #[node_macro::node(name("Path of Subgraph"), category(""))]
-pub fn path_of_subgraph(_: impl Ctx, node_path: List<NodeId>) -> List<NodeId> {
+pub fn path_of_subgraph(_: impl Ctx, node_path: Vec<NodeId>) -> Vec<NodeId> {
 	let len = node_path.len();
 	node_path.into_iter().take(len.saturating_sub(1)).collect()
 }
 
+/// The layer-path stamp: writes the owning layer's document node path on
+/// each lane, which lets editor tools trace data back to its layer.
+#[node_macro::node(category(""))]
+pub fn stamp_layer_path<'e, T>(ctx: impl Ctx + ExtractArena<'e>, element: T, path: Vec<NodeId>) -> Result<(T, Attr<'e, EditorLayerPath>), Interrupt> {
+	let (parked, _) = ctx.arena().alloc(path).ok_or(GraphError {
+		kind: core_types::gpoll::ErrorKind::ArenaExhausted,
+		trace: Vec::new(),
+	})?;
+	Ok((element, Attr(parked.as_slice())))
+}
+
 /// Sets a named attribute on the input `List`, computing one value per item via the value-producing input. That input
 /// is evaluated once per item, with the item's index and the item itself (as a `List` containing only that item,
 /// passed as a vararg) provided via context, so the upstream pipeline can return a different value per item that may