Better fix for 65877, which doesn't require disabling "Tab means Down" in the completion box (#167135 says some people like that :-).

I think I found a solution that makes everyone happy: if there's only one entry then Tab autoselects the first entry and completes again, allowing to use it like a shell for local files:

/hom<tab>dfau<tab>Docu<tab> for /home/dfaure/Documents.

If there's more than one entry, then Tab does "Down" as before.