Add user search widget to exam_users_edit.html for adding arbitrary users

generic/views.py

@@ -2419,6 +2419,15 @@ class ExamViews(View, LoginRequiredMixin):
             "app_name": self.app_name,
         }
 
+        # Provide a searchable widget to allow adding arbitrary users
+        try:
+            from generic.widgets import UserSearchSelectMultipleWidget
+
+            widget_html = UserSearchSelectMultipleWidget("add_users", []).render()
+            context["user_search_widget"] = mark_safe(widget_html)
+        except Exception:
+            context["user_search_widget"] = ""
+
         if self.app_name == "atlas":
             context["collection"] = exam