As the default fs is now btrfs and it's well known to be bad for VMs, I'm surprised this wasn't already implemented.

Since the folder is created on the fly in the user's home directory this can't be easily fixed through packaging. In fact the only way I can think of is to create a bash script wrapper for the gnome-boxes executable and check for the directory, create it if needed and chattr +C the directory.

Is there a better solution?

Thanks,

Richard