Input cursor jump on up/down if accidental change causes layout shift

Ubuntu 14.04, GIT commit: bbe146b

1) open attached score
2) click last note
3) N to enter note inut mode
4) up

Result: the added accidental causes a layout shift (last measure moves to next system, which is fine), but the input cursor position is not updated. I assume we need a moveCursor() call.

At some point, we could consider just having a moveCursor call in endCmd or something like that so we don't keep having things fall through the cracks like this, but I guess there is probably some reason that would be a bad idea.