[Tracker] probem with finding filenames

["gebi fastmail fm" <gebi fastmail fm>]

please have a look:

gebi kepler:~$ touch ayxcvbn.txt
gebi kepler:~$ tracker-search ayxcv

-> no results when searching for a partial file-name ?!

gebi kepler:~$ tracker-search ayxcvbn
/home/gebi/ayxcvbn.txt

fine -- works with a full file-name without extension.

now make a new filename - the same as above but with an underscore:

gebi kepler:~$ touch ayxcvbn_go.txt
gebi kepler:~$ tracker-search ayxcvbn
/home/gebi/ayxcvbn.txt
/home/gebi/ayxcvbn_go.txt

now I got all results !

gebi kepler:~$ tracker-search ayxcvb

but for a partial filename -> no results but for 

a "full" part of a filename it works:

gebi kepler:~$ tracker-search ayxcvbn
/home/gebi/ayxcvbn.txt
/home/gebi/ayxcvbn_go.txt


any hints ?
I think searching for filenames should have a similar behavior as locate
which searchs for  "*file*"
in this way it could be an "always up to date replacement" for locate
and an essential behavior when used in a filemanager.


I'm using tracker 0.6.4

gebi