Make filtering act on all descendants, like searching does

wagtail/admin/templates/wagtailadmin/pages/listing/_page_title_column_header.html

@@ -4,7 +4,7 @@
 {% block after_label %}
     {% if page_obj %}
         {% with start_index=page_obj.start_index end_index=page_obj.end_index result_count=page_obj.paginator.count %}
-            {% if is_searching %}
+            {% if is_searching or is_filtering %}
                 {% if is_searching_whole_tree %}
                     {% blocktranslate trimmed %}
                         {{ start_index }}-{{ end_index }} of {{ result_count }} across entire site.

wagtail/admin/ui/tables/pages.py

@@ -14,6 +14,7 @@ class PageTitleColumn(BaseColumn):
         context["page_obj"] = parent_context.get("page_obj")
         context["parent_page"] = parent_context.get("parent_page")
         context["is_searching"] = parent_context.get("is_searching")
+        context["is_filtering"] = parent_context.get("is_filtering")
         context["is_searching_whole_tree"] = parent_context.get(
             "is_searching_whole_tree"
         )
@@ -140,6 +141,7 @@ class PageTable(Table):
         context["page_obj"] = parent_context.get("page_obj")
         context["parent_page"] = parent_context.get("parent_page")
         context["is_searching"] = parent_context.get("is_searching")
+        context["is_filtering"] = parent_context.get("is_filtering")
         context["is_searching_whole_tree"] = parent_context.get(
             "is_searching_whole_tree"
         )

wagtail/admin/views/pages/listing.py

@@ -171,7 +171,7 @@ class BaseIndexView(GenericIndexView):
         return ordering
 
     def get_queryset(self):
-        if self.is_searching:
+        if self.is_searching or self.is_filtering:
             if self.is_searching_whole_tree:
                 pages = Page.objects.all()
             else: