Fix crash when reordering layers (#1492)

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

@@ -525,6 +525,10 @@ impl<'a> ModifyInputsContext<'a> {
 
 		let mut delete_nodes = vec![id];
 		for (_node, id) in self.network.upstream_flow_back_from_nodes(vec![id], true) {
+			// Don't delete the node if other layers depend on it.
+			if self.outwards_links.get(&id).is_some_and(|nodes| nodes.len() > 1) {
+				break;
+			}
 			if self.outwards_links.get(&id).is_some_and(|outwards| outwards.len() == 1) {
 				delete_nodes.push(id);
 			}

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

@@ -33,6 +33,7 @@ impl OriginalTransforms {
 	pub fn update<'a>(&mut self, selected: &'a [LayerNodeIdentifier], document: &'a Document, shape_editor: Option<&'a ShapeState>) {
 		match self {
 			OriginalTransforms::Layer(layer_map) => {
+				layer_map.retain(|layer, _| selected.contains(layer));
 				for &layer in selected {
 					layer_map.entry(layer).or_insert_with(|| document.metadata.upstream_transform(layer.to_node()));
 				}