remove lru_cache from toolbar (memory leak)

djangocms_versioning/plugin_rendering.py

@@ -3,6 +3,7 @@
 from cms import __version__ as cms_version
 from cms.plugin_rendering import ContentRenderer, StructureRenderer
 from cms.utils.placeholder import rescan_placeholders_for_obj
+from django.utils.functional import cached_property
 
 from . import versionables
 from .constants import DRAFT, PUBLISHED
@@ -50,15 +51,12 @@ def render_obj_placeholder(
         ):
             # FIXME This is an ad-hoc solution for page-specific rendering
             # code, which by default doesn't work well with versioning.
-            # Remove this method once the issue is fixed.
-            from cms.models import Placeholder
 
             current_obj = self.toolbar.get_object()
 
             # Not page, therefore we will use toolbar object as
             # the current object and render the placeholder
-            rescan_placeholders_for_obj(current_obj)
-            placeholder = Placeholder.objects.get_for_obj(current_obj).get(slot=slot)
+            placeholder = rescan_placeholders_for_obj(current_obj).get(slot)
             content = self.render_placeholder(
                 placeholder,
                 context=context,
@@ -77,12 +75,10 @@ def render_plugin(self, instance, page=None):
 
 
 class CMSToolbarVersioningMixin:
-    @property
-    @lru_cache(16)
+    @cached_property
     def content_renderer(self):
         return VersionContentRenderer(request=self.request)
 
-    @property
-    @lru_cache(16)
+    @cached_property
     def structure_renderer(self):
         return VersionStructureRenderer(request=self.request)