Fixes for bug#1035085 (grub-installer/os-prober quirks)
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1035085
This MR aims to fix the following issues:
- In expert install, the os-prober dialog shows only unsupported OS but not supported OS.
- "efi", "macosx" and "minix" os-prober types are added to the unsupported OS list although GRUB os-prober helper script can add menu entries for them, so these types should be added to the supported OS list instead.
- os-prober is needlessly enabled by default when only unsupported OS are detected.
Note: this MR does not fix issue #3 in bug#1035085 ("Changing the previous answer to "Run os-prober automatically to detect and boot other OSes" does not work as expected").
Edited by Pascal Hambourg