Preserve URL parameters on parent link in page chooser search results

Fixes #11955

wagtail/admin/templates/wagtailadmin/chooser/tables/parent_page_cell.html

@@ -1,7 +1,7 @@
 {% load wagtailadmin_tags %}
 <td {% if column.classname %}class="{{ column.classname }}"{% endif %}>
     {% if value %}
-        <a href="{% url 'wagtailadmin_choose_page_child' value.id %}" class="navigate-parent">{{ value.get_admin_display_title }}</a>
+        <a href="{% url 'wagtailadmin_choose_page_child' value.id %}{% querystring p=None q=None %}" class="navigate-parent">{{ value.get_admin_display_title }}</a>
         {% if show_locale_labels %}{% status value.locale.get_display_name classname="w-status--label" %}{% endif %}
     {% endif %}
 </td>

wagtail/admin/tests/test_page_chooser.py

@@ -371,12 +371,22 @@ class TestChooserSearch(WagtailTestUtils, TransactionTestCase):
         return self.client.get(reverse("wagtailadmin_choose_page_search"), params or {})
 
     def test_simple(self):
-        response = self.get({"q": "foobarbaz"})
+        response = self.get({"q": "foobarbaz", "allow_external_link": "true"})
         self.assertEqual(response.status_code, 200)
         self.assertTemplateUsed(response, "wagtailadmin/chooser/_search_results.html")
         self.assertContains(response, "There is 1 match")
         self.assertContains(response, "foobarbaz")
 
+        # parent page link should preserve the allow_external_link parameter
+        expected_url = (
+            reverse("wagtailadmin_choose_page_child", args=[self.root_page.id])
+            + "?allow_external_link=true"
+        )
+        self.assertContains(
+            response,
+            f'<a href="{expected_url}" class="navigate-parent">{self.root_page.title}</a>',
+        )
+
     def test_partial_match(self):
         response = self.get({"q": "fooba"})
         self.assertEqual(response.status_code, 200)