Drush gesso "New theme" - Not working

Seems to have been replaced in Drush 11.3+

We can of course replace, but we'd need to do something to make sure older versions Drush don't start falling over. New release for Drush 11+ rather than a direct dependency?

I still see issues after replacing

"use Webmozart\PathUtil\Path;"
To
"use Symfony\Component\Filesystem\Path;"

during the test

I fixed the other issue with getTheme and pushed the commit.