Fix shared articles on articles block

#223

uniweb/models.py

@@ -186,12 +186,11 @@ class ArticlesBlock(blocks.StructBlock):
     def get_context(self, value, parent_context=None):
         context = super().get_context(value, parent_context=parent_context)
         count = value["lines"] * ARTICLES_PER_LINE
-        context["articles"] = (
-            value["page"]
-            .get_children()
-            .live()
-            .specific()
-            .order_by("-uniwebarticlepage__date")[:count]
+        articles_page = value["page"]
+        context["articles"] = articles_page.materialize_shared_articles_query(
+            articles_page.append_all_shared_articles_query(
+                UniwebArticlePage.objects.child_of(articles_page)
+            )[:count]
         )
         return context