check against port not against node

Author: Kr0nox

src/features/dfdElements/portSnapper.ts

@@ -51,7 +51,7 @@ export class PortAwareSnapper implements ISnapper {
     private snapPort(position: Point, element: SPortImpl): Point {
         const parentElement = element.parent;
 
-        if (!(parentElement instanceof SNodeImpl)) {
+        if (parentElement instanceof SPortImpl) {
             // Parent is not a node, so we cannot snap the port to the node edges
             return position;
         }