2010/11/25 Christian Trippe email@example.com:
You probably mean the following feature Kickoff/Classic start menus: collapsing of application menu sub-folders with only one entry from http://en.opensuse.org/openSUSE:KDE_openSUSE_modifications
This means it is an openSUSE patch, which is probably not applied for 4.5
Yes, that's it. Probably it should be submitted upstream? It's in the freedesktop menu spec, and not only for one entry but for the user configurable "inline_limit" value.