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Could someone paste here ALL code from ps_categorytree.tpl after changes?  On my site, that code didn't work, prestasho p1.77, template: classic

for now i have:

public function getWidgetVariables($hookName = null, array $configuration = [])
    {
        $category = new Category((int) Configuration::get('PS_HOME_CATEGORY'), $this->context->language->id);

        if (Configuration::get('BLOCK_CATEG_ROOT_CATEGORY') && isset($this->context->cookie->last_visited_category) && $this->context->cookie->last_visited_category) {
            $category = new Category($this->context->cookie->last_visited_category, $this->context->language->id);
            if (Configuration::get('BLOCK_CATEG_ROOT_CATEGORY') == 2 && !$category->is_root_category && $category->id_parent) {
                $category = new Category($category->id_parent, $this->context->language->id);
            } elseif (Configuration::get('BLOCK_CATEG_ROOT_CATEGORY') == 3 && !$category->is_root_category && !$category->getSubCategories($category->id, true)) {
                $category = new Category($category->id_parent, $this->context->language->id);
            }
        }

        return [
            'categories' => $this->getCategories($category),
            'c_tree_path' => isset($categories['children']) && count($categories['children']) && method_exists($this->context->controller, 'getCategory') && ($curr_category = $this->context->controller->getCategory()) ? self::getTreePath($categories['children'], $curr_category->id) : false,
			'currentCategory' => $category->id,
        ];
    }
	
	public static function getTreePath($categories, $id, array $path = [])
{
    foreach ($categories as $cate) {
        if ($cate['id'] == $id){
            if(is_array($cate['children']) && count($cate['children']))
                $path[] = $cate['id'];
            return $path;
        }
        $path[] = $cate['id'];
        if(is_array($cate['children']) && count($cate['children'])) {
            if ($result = self::getTreePath($cate['children'], $id, $path))
                return $result;
        }
        array_pop($path);
    }
    return false;
}

from ps_categorytree.php and it from ps_categorytree.tpl:

{**
 * Copyright since 2007 PrestaShop SA and Contributors
 * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Academic Free License 3.0 (AFL-3.0)
 * that is bundled with this package in the file LICENSE.md.
 * It is also available through the world-wide-web at this URL:
 * https://opensource.org/licenses/AFL-3.0
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to [email protected] so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to https://devdocs.prestashop.com/ for more information.
 *
 * @author    PrestaShop SA and Contributors <contact@prestashop.com>
 * @copyright Since 2007 PrestaShop SA and Contributors
 * @license   https://opensource.org/licenses/AFL-3.0 Academic Free License 3.0 (AFL-3.0)
 *}

{function name="categories" nodes=[] depth=0}
  {strip}
    {if $nodes|count}
      <ul class="category-sub-menu">
        {foreach from=$nodes item=node}
          <li data-depth="{$depth}">
            {if $depth===0}
              <a href="{$node.link}">{$node.name}</a>
              {if $node.children}
                <div class="navbar-toggler collapse-icons{if $c_tree_path && !in_array($node.id, $c_tree_path)} collapsed zmiana{/if} cos1" data-toggle="collapse" data-target="#exCollapsingNavbar{$node.id}">
                  <i class="material-icons add">&#xE145;</i>
                  <i class="material-icons remove">&#xE15B;</i>
                </div>
                <div class="collapse{if $c_tree_path && in_array($node.id, $c_tree_path)} in zmiana2{/if} cos2" id="exCollapsingNavbar{$node.id}">
                  {categories nodes=$node.children depth=$depth+1}
                </div>
              {/if}
            {else}
              <a class="category-sub-link" href="{$node.link}">{$node.name}</a>
              {if $node.children}
                <span class="arrows{if $c_tree_path && !in_array($node.id, $c_tree_path)} collapsed zmiana3{/if} cos3" data-toggle="collapse" data-target="#exCollapsingNavbar{$node.id}">
                  <i class="material-icons arrow-right">&#xE315;</i>
                  <i class="material-icons arrow-down">&#xE313;</i>
                </span>
                <div class="collapse{if $c_tree_path && in_array($node.id, $c_tree_path)} in zmiana4{/if} cos4" id="exCollapsingNavbar{$node.id}">
                  {categories nodes=$node.children depth=$depth+1}
                </div>
              {/if}
            {/if}
          </li>
        {/foreach}
      </ul>
    {/if}
  {/strip}
{/function}

<div class="block-categories hidden-sm-down">
  <ul class="category-top-menu">
    <li><a class="text-uppercase h6" href="{$categories.link nofilter}">{$categories.name}</a></li>
    <li>{categories nodes=$categories.children}</li>
  </ul>
</div>