"New session" does not delete "session" build targets ?

Hi,

when I have created targets in the build plugin, they are saved in 
writeSessionConfig(), and loaded again when starting kate again via 
readSessionConfig().
So I assumed that "New session" should clear the build targets ?
I click "New session" and still my build targets from the session are there. 
This feels wrong to me.
I could have a look at changing that behaviour.
Comments ?

Alex