Twig lexer is missing support for the verbatim tag

[stof]

In Twig, anything between a {% verbatim %} tag and its following {% endverbatim %} tag is not parsed as Twig, but is part of the output as is. But the Twig syntax highlighter will still highlight Twig markup inside it.

The definition of this behavior also implies that you cannot nest a verbatim tag into another one:

{{ 'start'|title }}
{% verbatim %}
hello {{ world }}
{# that's not a Twig comment, and next line does not start a verbatim tag but writes such text #}
{% verbatim %} that's just output {% endverbatim %}
{{ 'that\'s actually Twig markup again here' }}
{# that one is a syntax error, as the only actual verbatim tag opened at the start ended above #}
{% endverbatim %}

Note that in Twig 1.x, there was a {% raw %}/{% endraw %} tag with the same behavior (start and end tag had to match), which was deprecated and does not exist anymore in Twig 2.x. I'm not sure whether you want to support it.