Function resetProjectionState

packages/core/src/render3/hmr.ts:396–409

* Child nodes mutate the `projection` state of their parent node as they're being projected. * This function resets the `project` back to its initial state. * @param tNode

(tNode: TElementNode)

 * @param tNode
 */
function resetProjectionState(tNode: TElementNode): void {
  // The `projection` is mutated by child nodes as they're being projected. We need to
  // reset it to the initial state so projection works after the template is swapped out.
  if (tNode.projection !== null) {
    for (const current of tNode.projection) {
      if (isTNodeShape(current)) {
        // Reset `projectionNext` since it can affect the traversal order during projection.
        current.projectionNext = null;
        current.flags &= ~TNodeFlags.isProjected;
      }
    }
    tNode.projection = null;
  }
}