Changed check_access() to use the same user reference to retrieve per…

…missions as used earlier in the method to check authentication

Using the context['user'] for the later check can break under certain conditions (ex. template-tags that customize context)

sitetree/sitetreeapp.py

@@ -916,7 +916,7 @@ def check_access(self, item: 'TreeItemBase', context: Context) -> bool:
             user_perms = self._current_user_permissions
 
             if user_perms is _UNSET:
-                user_perms = self.get_permissions(context['user'], item)
+                user_perms = self.get_permissions(self.current_request.user, item)
                 self._current_user_permissions = user_perms
 
             if item.access_perm_type == MODEL_TREE_ITEM_CLASS.PERM_TYPE_ALL: