Sonataadminbundle: to_string_callback is now String format only in 3.28

[Yippy]

I'm rendering a custom twig template within sonata_type_model_autocomplete
Works perfectly fine in
"sonata-project/admin-bundle": "3.27"

    $formMapper
        ->add('example_type', 'sonata_type_model_autocomplete', array(
                'container_css_class'   => 'select2-image',
                'class'                 => 'AppBundle:ExampleType',
                'to_string_callback'    => function($entity, $property) use ($engine) {
                    return $engine->render(
                        'AppBundle:ExampleTypeAdmin:autocomplete_example_type.html.twig',
                        ['example' => $entity]
                    );
                },
        ))
    ;

"sonata-project/admin-bundle": "3.28"
Latest admin bundle renders the selection as "string", is there a new way to render it HTML RAW?

[core23]

Sorry, but we try to keep github issues for feature requests and bugs only.

• Please have a look at the sonata docs
• Use StackOverflow for general support and help others as well
• Join #sonata on the symfony-devs slack for immediate help

[peter-gribanov]

@core23 this is a bug. You broke BC
https://stackoverflow.com/questions/34356403/how-customize-display-data-in-sonata-autocomplete

[core23]

Can you please name the PR which broke the BC?

[Yippy]

The only thing that could effect the Select2 is this PR.

https://github.com/sonata-project/SonataAdminBundle/pull/4796/files

[Yippy]

Just tested this using my project and wanted to confirm this PR #4796 prevent passing HTML through label, there is currently no bypass available. By preventing HTML passthrough you would not be able to take advantage of template in Select2 drop-down option select2
@ossinkine

[core23]

Maybe you could provide a PR where you can pass a new option to force html rendering.

HTML should be disabled in default for security reasons.

[ossinkine]

As workaround you can extend the template and override sonata_type_model_autocomplete_dropdown_item_format and sonata_type_model_autocomplete_selection_format blocks.
New option like is_safe in Twig will be great.