Check for dupes by exact URL if normalized URL is missing (#1204)

bookmarks/forms.py

@@ -11,7 +11,6 @@ from bookmarks.models import (
 )
 from bookmarks.services.bookmarks import create_bookmark, update_bookmark
 from bookmarks.type_defs import HttpRequest
-from bookmarks.utils import normalize_url
 from bookmarks.validators import BookmarkURLValidator
 
 
@@ -94,11 +93,8 @@ class BookmarkForm(forms.ModelForm):
         # raise a validation error in that case.
         url = self.cleaned_data["url"]
         if self.instance.pk:
-            normalized_url = normalize_url(url)
             is_duplicate = (
-                Bookmark.objects.filter(
-                    owner=self.instance.owner, url_normalized=normalized_url
-                )
+                Bookmark.query_existing(self.instance.owner, url)
                 .exclude(pk=self.instance.pk)
                 .exists()
             )