In wagtail currently a standard select is used for a one to many relation, and I'd like to override this to use a jquery UI autocomplete widget.
I found the template that renders the component in wagtail/admin/templates/wagtailadmin/shared/collection_chooser.html, so I Thought that by following the instructions I could override the template the way I would a base one, but unfortunately when I create myapp/templates/wagtailadmin/shared/collection_chooser.html it is not rendered in place of the base one. I did confirm that by creating myapp/templates/wagtailadmin/base.html that does get used.
How can I override this template short of editing the source?