Fixed -- Improved loading of navigation sidebar in admin.
<link rel="stylesheet" type="text/css" href="{% block stylesheet %}{% static "admin/css/base.css" %}{% endblock %}">
{% if not is_popup and is_nav_sidebar_enabled %}
<link rel="stylesheet" type="text/css" href="{% static "admin/css/nav_sidebar.css" %}">
+ <script src="{% static 'admin/js/nav_sidebar.js' %}" defer></script>
{% endif %}
{% block extrastyle %}{% endblock %}
{% if LANGUAGE_BIDI %}<link rel="stylesheet" type="text/css" href="{% block stylesheet_rtl %}{% static "admin/css/rtl.css" %}{% endblock %}">{% endif %}
</div>
</div>
<!-- END Container -->
-
-{% if not is_popup and is_nav_sidebar_enabled %}
- <script src="{% static 'admin/js/nav_sidebar.js' %}" async></script>
-{% endif %}
</body>
</html>
