Comment # 2 on bug 1101756 from Felix Miata

(In reply to Neil Rickert from comment #1)
> You should be able to create the "opensuse150" entry that you want by
> manually editing "/etc/default/grub" and setting GRUB_DISTRIBUTOR . 

This bug is about not needing to do so (which I did do, no other choice), to
not need to either F8/F12/F?? UEFI boot or edit a stanza at runtime on first
boot subsequent to openSUSE installation, to have exactly the expected boot
configuration from custom.cfg front and center immediately. The current
situation produces the same result as installing Windows, usurping the existing
boot configuration as a consequence of adding an OS to a multiboot system. To
avoid this currently all but demands that install no bootloader be selected,
then when booted, edit GRUB_DISTRIBUTOR and install bootloader either manually
(vexing) or using YaST2, the only YaST2 difference being including the desired
GRUB_DISTRIBUTOR instead of the generic template.

What I have ATM:
# efibootmgr
BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0000,0001,0004,0002,0005
Boot0000* opensusetw
Boot0001* debian10
Boot0002* UEFI OS
Boot0004* opensuse150
Boot0005* tubuntu

Choosing 2 or 5 from the BIOS UEFI menu produces only a grub> prompt. The
others produce functional grub menus.