Instance tables refactor part 5: unwrap GraphicGroup as multi-row Instance<GraphicElement> tables and move up transforms (#2363)

* Just group

* Partly working but without transforms

* Remove Transform/TransformMut from GraphicElement and GraphicGroupTable

* Fix layers and flattening

* Fix transform group handling on the remaining nodes

* Change collect metadata

* Add transform on vector data. TODO: Remove duplicate transform

* Small code tidying-up

* Add concatenate node?

* Remove ignore_modifications which is always false

* Improve transforms

* Mostly fix the nested transform cage angle (except leaf layers and skew)

* WIP attempt to integrate skew

* Fix nesting bounding box

* Avoid setting the transform

* Fix stroke transforms

* Renderer cleanup

* Fix tests for repeated elements not given unique point IDs

* Suppress cargo-deny warning

* Fix upgrade code for graphic group data

* Work around rendering issue in Isometric Fountain

---------

Co-authored-by: Adam <adamgerhant@gmail.com>
Co-authored-by: hypercube <0hypercube@gmail.com>

frontend/src/io-managers/persistence.ts

@@ -74,7 +74,7 @@ export function createPersistenceManager(editor: Editor, portfolio: PortfolioSta
 
 		const orderedSavedDocuments = documentOrder.flatMap((id) => (previouslySavedDocuments[id] ? [previouslySavedDocuments[id]] : []));
 
-		if (currentDocumentId) {
+		if (currentDocumentId && currentDocumentId in previouslySavedDocuments) {
 			const doc = previouslySavedDocuments[currentDocumentId];
 			editor.handle.openAutoSavedDocument(BigInt(doc.details.id), doc.details.name, doc.details.isSaved, doc.document, false);
 			editor.handle.selectDocument(BigInt(currentDocumentId));