upgrade to django CMS 3.9

Author: Mario Colombo

.gitignore

@@ -18,3 +18,5 @@ db.sqlite3
 ._*
 .Spotlight-V100
 .Trashes
+
+.idea/

quickstart/urls.py

@@ -10,4 +10,7 @@
 if settings.DEBUG:
     urlpatterns.extend(static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT))
 
-urlpatterns.append(path('', include('cms.urls')))
+urlpatterns.append(path('', include('cms.urls')))
+
+# the new django admin sidebar is bad UX in django CMS custom admin views.
+admin.site.enable_nav_sidebar = False

requirements.txt

@@ -1,4 +1,4 @@
-django>=3.1,<3.2
+django>=3.1,<3.2  # 3.2 has dark admin theme which looks bad in custom django CMS admin views
 dj-database-url==0.5.0
 django-storage-url==0.5.0
 whitenoise==5.2.0
@@ -9,8 +9,7 @@ psycopg2==2.8.5
 uwsgi==2.0.19.1
 
 # key requirements for django CMS
-django-cms>=3.8,<3.9
-django-treebeard>=4.0,<5.0
+django-cms<4
 django-classy-tags>=2.0
 django-sekizai>=2.0
 six