Enable breadcrumbs for collections create and edit views

wagtail/admin/tests/test_collections_views.py

@@ -207,7 +207,13 @@ class TestAddCollectionAsSuperuser(AdminTemplateTestUtils, WagtailTestUtils, Tes
         response = self.get()
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, self.root_collection.name)
-        self.assertBreadcrumbsNotRendered(response.content)
+        self.assertBreadcrumbsItemsRendered(
+            [
+                {"label": "Collections", "url": "/admin/collections/"},
+                {"label": "New: Collection", "url": ""},
+            ],
+            response.content,
+        )
 
     def test_post(self):
         response = self.post(
@@ -326,7 +332,13 @@ class TestEditCollectionAsSuperuser(AdminTemplateTestUtils, WagtailTestUtils, Te
         response = self.get()
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, "Delete collection")
-        self.assertBreadcrumbsNotRendered(response.content)
+        self.assertBreadcrumbsItemsRendered(
+            [
+                {"url": "/admin/collections/", "label": "Collections"},
+                {"url": "", "label": str(self.collection)},
+            ],
+            response.content,
+        )
 
     def test_cannot_edit_root_collection(self):
         response = self.get(collection_id=self.root_collection.id)

wagtail/admin/views/collections.py

@@ -51,6 +51,7 @@ class Create(CreateView):
     edit_url_name = "wagtailadmin_collections:edit"
     index_url_name = "wagtailadmin_collections:index"
     header_icon = "folder-open-1"
+    _show_breadcrumbs = True
 
     def get_form(self, form_class=None):
         form = super().get_form(form_class)
@@ -81,6 +82,7 @@ class Edit(EditView):
     delete_url_name = "wagtailadmin_collections:delete"
     context_object_name = "collection"
     header_icon = "folder-open-1"
+    _show_breadcrumbs = True
 
     def _user_may_move_collection(self, user, instance):
         """