Edit scheme files with Frescobaldi

[Curt McDowell]

Hi all,

Some of my projects #(load "external_scheme_files"). For example, if 
song.ly contains

   \version "2.20.0"
   \include "articulate.ly"
   #(load "swing.scm")
   \header {
   ...

then if I open song.ly in Frescobaldi and use Engrave (preview), it 
doesn't find swing.scm (doesn't know to copy it to the tempdir?) And if 
I Open swing.scm in Frescobaldi, it tries to compile that as a .ly format.

Is there a way to open .scm files in Frescobaldi alongside the .ly 
files, be able to edit them all and engrave/publish on demand (maybe 
using a session)? I haven't found how in the docs.

Thanks!
Curt