If you are playing "How High The Moon" in G, obviously the tune passes through several tonal centers. It start in G, moves down a whole tone to F, then to Eb.
Let's say you are playing the straight melody, with your index finger at the fifth fret. You get to measure 5 with the Fmaj7. You can move down two frets so your index finger is at the third fret and finger everything the same, or you can just stay where you were (at the fifth fret) and play the F major phrase there.
Similar situations come up all the time in tunes and I know this relates to Ted Eschilman's FFcP framework. I am curious as to how other mandolin players approach these brief excursions into other keys (tonal centers). Move to a new position, or stay where you were?