Finding files in debug mode

[Aki Teppo]

Maybe somebody has asked this already, but how can I step into for
example JDK
source files during debugging without losing my current project
settings. In essence,
source-directories option is lost when I step one line into a JDK file
and project settings are
restored to default settings. Then it's quite hard to get back to my own
source files.
I'm using oldjdb interface.

Regards, Aki