Compatibility: menu_link_attributes link classes not rendered in menu--main.html.twig

[jjroelofs]

Summary

The menu--main.html.twig template hardcodes class="nav-link" (and class="dropdown-item" for submenus) on menu link <a> tags, ignoring any custom link classes set via the menu_link_attributes module.

Steps to reproduce

1. Enable the menu_link_attributes module (ships with DXPR CMS)
2. Edit a main menu link and add a Link class such as btn btn-primary
3. The class is stored correctly in the link options: {"attributes":{"class":["btn","btn-primary"]}}
4. However, the rendered HTML outputs only class="nav-link" — the custom classes are lost

Root cause

In menu--main.html.twig, the link element is built with a literal class attribute:

{# Line ~109: Simple top-level item #}
<{{ item_link_tag }}
  class="nav-link"
  ...
  role="menuitem">{{ item.title }}</{{ item_link_tag }}>

The URL's options/attributes (which carry the menu_link_attributes classes) are never merged into the <a> tag. This pattern repeats for all link types in the template (split dropdown, full toggle, submenu items).

Expected behavior

Custom link classes from menu_link_attributes should be merged with the base classes. For example, a CTA button in the nav should render as:

<a class="nav-link btn btn-primary" href="/shop" role="menuitem">Pre-order</a>

Suggested fix

Use item.url.getOption('attributes') in the template to merge custom attributes, similar to how item.attributes is used on the <li> element for container_class.

Environment

• DXPR Theme: latest (1.x branch)
• Drupal: 11.3.5
• menu_link_attributes: enabled