fix(subflows): use abs positions for internal calculations (#2189)

* refactor(dragging): only use absolute positions
* refactor(drag): handle node extent
* refactor(drag-handler): return latest data
* refactor(use-drag): cleanup

fixes #2181

src/store/index.ts

@@ -99,7 +99,16 @@ const createStore = () =>
           };
 
           if (positionChanged) {
+            change.positionAbsolute = node.position;
             change.position = node.position;
+
+            if (node.parentNode) {
+              const parentNode = nodeInternals.get(node.parentNode);
+              change.position = {
+                x: change.position.x - (parentNode?.positionAbsolute?.x ?? 0),
+                y: change.position.y - (parentNode?.positionAbsolute?.y ?? 0),
+              };
+            }
           }
 
           return change;