[py-dev] another traceback cut weirdness

[Ronny Pfannschmidt]

i just noticed that traceback.cut will return a traceback
with all other filtering undone again
since it passes a raw traceback entry into the Traceback ctor.

is there any deeper reason for that or did it just work, cause cutting
always was first

if its not intentional i could add a .filter(lambda entry: entry in
self) to get it solved

-- Ronny