Move automatic handling of LiveStatusTagColumn to IndexViewOptionalFeaturesMixin

This allows us to avoid inspecting the index view class's list_display
in the viewsets, which in turn allows us to use cached property on the
view.

wagtail/admin/views/generic/mixins.py

@@ -21,7 +21,7 @@ from wagtail.admin.forms.models import WagtailAdminModelForm
 from wagtail.admin.models import EditingSession
 from wagtail.admin.templatetags.wagtailadmin_tags import user_display_name
 from wagtail.admin.ui.editing_sessions import EditingSessionsModule
-from wagtail.admin.ui.tables import TitleColumn
+from wagtail.admin.ui.tables import LiveStatusTagColumn, TitleColumn
 from wagtail.admin.utils import get_latest_str, set_query_params
 from wagtail.locks import BasicLock, ScheduledForPublishLock, WorkflowLock
 from wagtail.log_actions import log
@@ -224,6 +224,13 @@ class IndexViewOptionalFeaturesMixin:
             return queryset
         return super()._annotate_queryset_updated_at(queryset)
 
+    @cached_property
+    def list_display(self):
+        list_display = super().list_display.copy()
+        if issubclass(self.model, DraftStateMixin):
+            list_display.append(LiveStatusTagColumn())
+        return list_display
+
 
 class CreateEditViewOptionalFeaturesMixin:
     """

wagtail/admin/viewsets/model.py

@@ -410,7 +410,7 @@ class ModelViewSet(ViewSet):
         (i.e. does not inherit from TranslatableMixin), then the LocaleColumn is
         excluded by the default IndexView.columns property.
         """
-        return self.index_view_class.list_display
+        return self.UNDEFINED
 
     @cached_property
     def list_filter(self):

wagtail/snippets/views/snippets.py

@@ -18,7 +18,6 @@ from wagtail.admin.ui.side_panels import ChecksSidePanel, PreviewSidePanel
 from wagtail.admin.ui.tables import (
     BulkActionsCheckboxColumn,
     Column,
-    LiveStatusTagColumn,
     TitleColumn,
 )
 from wagtail.admin.views import generic
@@ -777,13 +776,6 @@ class SnippetViewSet(ModelViewSet):
             per_page=self.chooser_per_page,
         )
 
-    @cached_property
-    def list_display(self):
-        list_display = super().list_display.copy()
-        if self.draftstate_enabled:
-            list_display.append(LiveStatusTagColumn())
-        return list_display
-
     @cached_property
     def icon(self):
         return self.get_icon()