message: fix(zIndex): calculate zIndex for nested flows correctly
diff: @@ -33,7 +33,7 @@ function calculateXYZPosition(
  return calculateXYZPosition(parentNode, nodeInternals, parentNodes, {
  x: (result.x ?? 0) + (parentNode.position?.x ?? 0),
  y: (result.y ?? 0) + (parentNode.position?.y ?? 0),
  - z: (parentNode.z ?? 0) > (node.z ?? 0) ? parentNode.z ?? 0 : node.z ?? 0,
  + z: (parentNode.z ?? 0) > (result.z ?? 0) ? parentNode.z ?? 0 : result.z ?? 0,
  });
  }
  @@ -43,6 +43,7 @@ export function createNodeInternals(nodes: Node[], nodeInternals: NodeInternals)
  nodes.forEach((node) => {
  const z = isNumeric(node.zIndex) ? node.zIndex : node.dragging || node.selected ? 1000 : 0;
  +
  const internals: Node = {
  ...nodeInternals.get(node.id),
  ...node,
  