Revert "Revert "descendants calc always lazy to ensure same order as …

…before""

This reverts commit 418afdd.

packages/react-testing/src/element.ts

@@ -85,14 +85,11 @@ export class Element<Props> implements Node<Props> {
   constructor(
     private readonly tree: Tree<Props>,
     private readonly allChildren: (Element<unknown> | string)[],
-    elementDescendants: Element<unknown>[] | null,
     public readonly root: Root,
   ) {
     this.elementChildren = allChildren.filter(
       element => typeof element !== 'string',
     ) as Element<unknown>[];
-
-    this.descendantsCache = elementDescendants;
   }
 
   data(key: string): string | undefined {

packages/react-testing/src/root.tsx

@@ -287,8 +287,6 @@ function defaultRender(element: React.ReactElement<unknown>) {
 function fiberToElement(
   element: Fiber,
   root: Root<unknown>,
-  descendants = [],
-  rootLevel = true,
 ): Element<unknown> | string {
   const node: Fiber = findCurrentFiberUsingSlowPath(element);
 
@@ -297,7 +295,7 @@ function fiberToElement(
   }
 
   const props = {...((node.memoizedProps as any) || {})};
-  const children = childrenToTree(node.child, root, descendants);
+  const children = childrenToTree(node.child, root);
 
   return new Element(
     {
@@ -307,22 +305,17 @@ function fiberToElement(
       instance: node.stateNode,
     },
     children,
-    rootLevel ? descendants.reverse() : null,
     root,
   );
 }
 
-function childrenToTree(fiber: Fiber | null, root: Root<unknown>, descendants) {
+function childrenToTree(fiber: Fiber | null, root: Root<unknown>) {
   let currentFiber = fiber;
   const children: (string | Element<unknown>)[] = [];
 
   while (currentFiber != null) {
-    const result = fiberToElement(currentFiber, root, descendants, false);
+    const result = fiberToElement(currentFiber, root);
     children.push(result);
-    if (typeof result !== 'string') {
-      descendants.push(result);
-    }
-
     currentFiber = currentFiber.sibling;
   }