Group node fixes (#2259)

* Prevent cleaning graph state on undo/redo

* Remove pause rendering due to LG bug

* Fix crash on disconnected internal reroutes

* Fix widget inputs being incorrect order and value

* Fix initial primitive values on connect

* basic support for basic rerouted converted inputs

* Populate primitive to reroute input

* dont crash on bad primitive links

* Fix convert to group changing control value

* reduce restrictions

* fix random crash in tests

tests-ui/utils/ezgraph.js

@@ -78,6 +78,14 @@ export class EzInput extends EzSlot {
 		this.input = input;
 	}
 
+	get connection() {
+		const link = this.node.node.inputs?.[this.index]?.link;
+		if (link == null) {
+			return null;
+		}
+		return new EzConnection(this.node.app, this.node.app.graph.links[link]);
+	}
+
 	disconnect() {
 		this.node.node.disconnectInput(this.index);
 	}