Fix regresion from #2265 causing an extra default artboard to show up

Author: Keavon

editor/src/messages/portfolio/portfolio_message_handler.rs

@@ -595,7 +595,9 @@ impl MessageHandler<PortfolioMessage, PortfolioMessageData<'_>> for PortfolioMes
 					};
 
 					let Some(ref reference) = node_metadata.persistent_metadata.reference.clone() else {
-						log::error!("could not get reference in deserialize_document");
+						// TODO: Investigate if this should be an expected case, because currently it runs hundreds of times normally.
+						// TODO: Either delete the commented out error below if this is normal, or fix the underlying issue if this is not expected.
+						// log::error!("could not get reference in deserialize_document");
 						continue;
 					};
 

node-graph/gcore/src/instances.rs

@@ -118,9 +118,15 @@ impl<T> Instances<T> {
 	}
 }
 
-impl<T: Default + Hash> Default for Instances<T> {
+impl<T: Default + Hash + 'static> Default for Instances<T> {
 	fn default() -> Self {
-		Self::new(T::default())
+		use core::any::TypeId;
+		if TypeId::of::<T>() == TypeId::of::<crate::Artboard>() {
+			// TODO: Remove the 'static trait bound when this special casing is removed by making all types return empty
+			Self::empty()
+		} else {
+			Self::new(T::default())
+		}
 	}
 }