As per review of v1, I changed all process callings to asynchronous calls, cleaned a bit in general, and also called super._onDestroy at the end

Newer version approved. If passing the `G_SPAWN_DO_NOT_REAP_CHILD` you must use a child watch function or you will leave zombie processes. Additionally spawning an process asynchronously then reading the output synchronously will still block the main thread. Perhaps you want to consider using `Gio.Subprocess.communicate_utf8_async()` for this use case. There are some examples here: https://www.andyholmes.ca/articles/subprocesses-in-gjs.html#communicating-with-processes