This bug is not about enabling writes through disk filters, but about not writing on those systems as part of the boot logic. Support for writes and hence GRUB_SAVEDEFAULT is a separate feature request I'd suggest you to take upstream.
This bug is not about enabling writes through disk filters, but about not writing on those systems as part of the boot logic. Support for writes and hence GRUB_SAVEDEFAULT is a separate feature request I'd suggest you to take upstream.