Rebuild the layer tree at the end, not after each step

Author: Keavon

editor/src/messages/portfolio/document/graph_operation/graph_operation_message_handler.rs

@@ -492,6 +492,9 @@ fn import_usvg_node(
 			modify_inputs.import_mode = false;
 			modify_inputs.layer_node = Some(layer);
 
+			// Rebuild the layer tree once now that all wiring is complete
+			modify_inputs.network_interface.load_structure();
+
 			// Set positions for all imported descendants in a single O(n) pass
 			let parent_pos = modify_inputs.network_interface.position(&layer.to_node(), &[]).unwrap_or(IVec2::ZERO);
 			set_import_child_positions(modify_inputs.network_interface, layer, parent_pos, &child_extents_svg_order, &group_extents_map);

editor/src/messages/portfolio/document/utility_types/network_interface.rs

@@ -3832,9 +3832,8 @@ impl NodeNetworkInterface {
 	}
 
 	/// Lightweight version of `set_input` for bulk import operations.
-	/// Directly sets the input without `is_acyclic` checks, position conversions, or per-node cache
-	/// invalidation. Only `load_structure` and outward wire invalidation are performed as they are
-	/// needed for correct wiring of subsequent nodes. Call `unload_all_nodes_click_targets` and
+	/// Directly sets the input without `is_acyclic` checks, `load_structure`, position conversions,
+	/// or per-node cache invalidation. Call `load_structure`, `unload_all_nodes_click_targets`, and
 	/// `unload_all_nodes_bounding_box` once after all import wiring is complete.
 	pub fn set_input_for_import(&mut self, input_connector: &InputConnector, new_input: NodeInput, network_path: &[NodeId]) {
 		let Some(network) = self.network_mut(network_path) else {
@@ -3865,11 +3864,6 @@ impl NodeNetworkInterface {
 
 		self.transaction_modified();
 		self.unload_outward_wires(network_path);
-
-		// Rebuild the layer tree structure so parent-child relationships are correct for subsequent operations
-		if network_path.is_empty() {
-			self.load_structure();
-		}
 	}
 
 	pub fn set_input(&mut self, input_connector: &InputConnector, new_input: NodeInput, network_path: &[NodeId]) {