view-attachment.php

<?php
/**
 * Implements hook_views_pre_build().
 */
function dingens_search_views_pre_build(ViewExecutable $view) {
  $functions = [];
  $functions[] = sprintf('dingens_search_views__%s__pre_build', $view->id());
  $functions[] = sprintf('dingens_search_views__%s_%s__pre_build', $view->id(), $view->current_display);
  foreach ($functions as $callback) {
    if (is_callable($callback)) {
      call_user_func_array($callback, [$view]);
    }
  }
}

/**
 * Implements hook_views_pre_build() on behalf of view
 * landingpage:landingpage__legacy_push_child.
 */
function dingens_search_views__landingpage_landingpage__legacy_push_child__pre_build(ViewExecutable $view) {
  $arguments = \Drupal::state()->get('dingens_search:landingpage:arguments', []);
  if (!empty($arguments[$view->args[0]])) {
    $view->args[1] = $arguments[$view->args[0]];
  }
}

/**
 * Implements hook_views_pre_render().
 */
function dingens_search_views_pre_render(ViewExecutable $view) {
  $functions = [];
  $functions[] = sprintf('dingens_search_views__%s__pre_build', $view->id());
  $functions[] = sprintf('dingens_search_views__%s_%s__pre_build', $view->id(), $view->current_display);
  foreach ($functions as $callback) {
    if (is_callable($callback)) {
      call_user_func_array($callback, [$view]);
    }
  }
}

/**
 * Implements hook_views_pre_render() on behalf of view
 * landingpage:landingpage_keyword.
 */
function dingens_search_views__landingpage_landingpage_keyword__pre_render(ViewExecutable $view) {
  $arguments = \Drupal::state()->get('dingens_search:landingpage:arguments', []);
  // Update argument with results.
  $nids = [];
  foreach ($view->result as $row) {
    $nids[] = $row->{'entity:node/nid'}[0];
  }
  if (isset($view->args[1]) && 'all' === $view->args[1]) {
    $arguments[$view->args[0]] = implode(',', $nids);
    \Drupal::state()->set('dingens_search:landingpage:arguments', $arguments);
  }
}