Enable partial matching on images index view where available (#10215)

Fixes #10213

wagtail/images/tests/test_admin_views.py

@@ -78,6 +78,13 @@ class TestImageIndexView(WagtailTestUtils, TestCase):
         self.assertContains(response, "a cute kitten")
         self.assertNotContains(response, "a cute puppy")
 
+    def test_search_partial_match(self):
+        response = self.get({"q": "kit"})
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.context["query_string"], "kit")
+        self.assertContains(response, "a cute kitten")
+        self.assertNotContains(response, "a cute puppy")
+
     def test_collection_query_search(self):
         root_collection = Collection.get_first_root_node()
         child_collection = [

wagtail/images/views/images.py

@@ -26,6 +26,7 @@ from wagtail.images.models import Filter, SourceImageIOError
 from wagtail.images.permissions import permission_policy
 from wagtail.images.utils import generate_signature
 from wagtail.models import Collection, Site
+from wagtail.search.backends import get_search_backend
 
 permission_checker = PermissionPolicyChecker(permission_policy)
 
@@ -104,7 +105,18 @@ class BaseListingView(TemplateView):
             if self.form.is_valid():
                 query_string = self.form.cleaned_data["q"]
                 if query_string:
-                    images = images.search(query_string)
+                    search_backend = get_search_backend()
+                    if images.model.get_autocomplete_search_fields():
+                        try:
+                            images = search_backend.autocomplete(query_string, images)
+                        except NotImplementedError:
+                            images = search_backend.search(
+                                query_string, images, partial_match=True
+                            )
+                    else:
+                        images = search_backend.search(
+                            query_string, images, partial_match=True
+                        )
         else:
             self.form = SearchForm(placeholder=_("Search images"))