I installed OpenSuse 12.3 and was not able to see my Fedora system listed in the grub.cfg file. Fedora is installed on this same system, along with Ubuntu.
However, with Fedora, OpenSuse 12.3 is listed in the Fedora version of grub.cfg.
With Fedora 18, during the beta and release candidates, an updated version of osprober was distributed. Fedora shows all operating systems.
Perhaps its time for a fork of the Fedora source be used to update the Suse version.
Mint showed Fedora, but not Suse.
I write software and that is why I have multiple versions of operating systems. I test live, not via vm systems.