Initial key signature not transposed via dialog on imported MIDI file

Ubuntu 14.04, GIT commit: 7c37c6b

1) import attached MIDI file Chandelier_Flute.mid
2) select all
3) notes / transpose
4) Key of C, transpose key signature

Result: notes transpose, but key signature does not

Cause seems to be that the initial key signature is marked as "generated", and the transposition code skips those. My guess is there are other things that might do wrong if the initial key signature is marked generated; this was just the behavior that was noticed (see http://musescore.org/en/node/43266#comment-199551).

I have another MIDI file that imports and transposes just fine - the initial key signature is not marked generated. I have no idea what the difference is. But it's attached as db.mid