Extending staff lines through key change

[Cynthia Karl]

I’m engraving a piece that ends with a D.C. al Fine.  Also the key at the beginning of the piece is different from the key at the end of the piece.  So, in order to cue the performer, a final key change is issued for the initial key:

\version "2.19.32"

{ \relative c'' {

    \key g\major

    \repeat unfold 4 { c d e fis }

    \break

    

    \key f\major

    \repeat unfold 4 { c d e f }

    \mark\markup { D.C. }

    \key g\major

} }

The problem with this is that the staff lines do not extend through the final key change.  Is there a way do do this?