Function applyNodes

packages/core/src/render3/node_manipulation.ts:754–849

* Performs the operation of `action` on the node. Typically this involves inserting or removing * nodes on the LView or projection boundary.

(
  renderer: Renderer,
  action: WalkTNodeTreeAction,
  tNode: TNode | null,
  lView: LView,
  parentRElement: RElement | null,
  beforeNode: RNode | null,
  isProjection: boolean,
)

 * nodes on the LView or projection boundary.
 */
function applyNodes(
  renderer: Renderer,
  action: WalkTNodeTreeAction,
  tNode: TNode | null,
  lView: LView,
  parentRElement: RElement | null,
  beforeNode: RNode | null,
  isProjection: boolean,
) {
  while (tNode != null) {
    ngDevMode && assertTNodeForLView(tNode, lView);
    const injector = lView[INJECTOR];

    // Let declarations don't have corresponding DOM nodes so we skip over them.
    if (tNode.type === TNodeType.LetDeclaration) {
      tNode = tNode.next;
      continue;
    }

    ngDevMode &&
      assertTNodeType(
        tNode,
        TNodeType.AnyRNode | TNodeType.AnyContainer | TNodeType.Projection | TNodeType.Icu,
      );
    const rawSlotValue = lView[tNode.index];
    const tNodeType = tNode.type;
    if (isProjection) {
      if (action === WalkTNodeTreeAction.Create) {
        rawSlotValue && attachPatchData(unwrapRNode(rawSlotValue), lView);
        tNode.flags |= TNodeFlags.isProjected;
      }
    }
    if (!isDetachedByI18n(tNode)) {
      if (tNodeType & TNodeType.ElementContainer) {
        applyNodes(renderer, action, tNode.child, lView, parentRElement, beforeNode, false);
        applyToElementOrContainer(
          action,
          renderer,
          injector,
          parentRElement,
          rawSlotValue,
          tNode,
          beforeNode,
          lView,
        );
      } else if (tNodeType & TNodeType.Icu) {
        const nextRNode = icuContainerIterate(tNode as TIcuContainerNode, lView);
        let rNode: RNode | null;
        while ((rNode = nextRNode())) {
          applyToElementOrContainer(
            action,
            renderer,
            injector,
            parentRElement,
            rNode,
            tNode,
            beforeNode,
            lView,