Enable rendering Symfony Forms fields in FieldGroup

[dlouhak]

• This is hotfix solution to be able render Symfony Forms fields[SFF] inside FieldGroup. There is no problem to render other components such as Text, Radio or more complex Accordion.
• I will explain how I get to the solution below.
• Better solutions and explanations are welcomed. 🙏

---

There's something I don't understand.

1. ❌ Current implementation

{% if block('content') is not empty %}
    <div class="{{ _fieldsClassName }}">
        {% block content %}{% endblock %}
    </div>
{% endif %}

• Not possible to render SFF (via form_row or form_widget), but form_label is rendered! 🤯
• SFF isn't even in the dump(block('content')) log.

2. ❌ Store block('content') into the variable

{% if block('content') is not empty %}
    {% set _children = block('content') %}

    <div class="{{ _fieldsClassName }}">
        {{ _children }}
    </div>
{% endif %}

• Still not possible to render SFF and it isn't seen in the dump(_children) log.

3. ✅ Store block('content') into the variable outside the implementation

{# API #}
…
{% set _children = block('content') %}
…

{% if _children is not empty %}
    <div class="{{ _fieldsClassName }}">
        {{ _children | raw }}
    </div>
{% endif %}

• Finally – I can see the SFF in the dump(_children) and is it possible to render it – but because it was stored in a variable it was converted to a string, so raw filter is here to help.

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[coveralls]

coverage: 72.818%. remained the same
when pulling 24227cf on fix/enable-rendering-symfony-forms-fields-in-fieldgroup
into 84ef862 on main.

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[dlouhak]

Works on my machine! 🖥️ ✅

Thanks @literat and @adamkudrna for the discussion and quick handling of the issue. ❤️