Changed default object group behavior.

src/common/graph/graph.ts

@@ -40,7 +40,6 @@ export class Graph
     public nodes: Node[];
     public links: Link[];
     public objectGroups: NodeType[];
-    private defaultGroup: NodeType;
     public initialized: boolean;
 
     public idToObjectGroup: Map<number, NodeType>;
@@ -140,18 +139,17 @@ export class Graph
         return this;
     }
 
+    /**
+     * Makes sure a default object group exists, if there is no object group.
+     * @private
+     */
     private createDefaultObjectGroupIfNeeded() {
-        const defaultGroup = this.objectGroups.find(
-            (group) => group.name == "Default"
-        );
-        if (defaultGroup == undefined) {
-            this.defaultGroup = this.createObjectGroup({
+        if (this.objectGroups.length == 0) {
+            this.createObjectGroup({
                 id: ++this.nextObjectGroupId,
                 name: "Default",
                 color: "#000000",
             });
-        } else {
-            this.defaultGroup = defaultGroup;
         }
     }
 
@@ -204,7 +202,7 @@ export class Graph
         const node = new Node();
         node.fromSerializedObject(data);
         const group = this.idToObjectGroup.get(data.type);
-        node.type = group != undefined ? group : this.defaultGroup;
+        node.type = group != undefined ? group : this.objectGroups[0];
         node.neighbors = [];
         node.links = [];
         this.addNode(node);