LT;DR Basically, we now need to symlink plugins on post-update-cmd as well because composer has "fixed" it's behavior so that composer install without a lock file is actually seen as an update, and no longer fires post-install-cmd. This broke Laravel's installer as well.
https://github.com/composer/composer/issues/5066#issuecomment-196979820
LT;DR Basically, we now need to symlink plugins on
post-update-cmdas well because composer has "fixed" it's behavior so thatcomposer installwithout a lock file is actually seen as an update, and no longer firespost-install-cmd. This broke Laravel's installer as well.