I've read the documentation on template inheritance. That is not what I am
trying to do.
In php templates, I can do something like this:
<?php if ($view['slots']->has('sidebar')): ?>
<div id="sidebar">
<?php echo $view['slots']->output('sidebar'); ?>
</div>
<?php endif; ?>
However I don't see a way to accomplish that in twig because I haven't found
a way to check in the layout if a block has been defined in the child
template.
I would need something like
{% ifblock sidebar %}
<div id="sidebar">
{% block sidebar %}
{% endblock sidebar %}
</div>
{% endifblock %}
where {% ifblock sidebar %} would check if the block "sidebar " has been
defined in the child template, If true, then it will render the markup
wrapping the block and the block.
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