bug#50789: syncthing-gtk creates autostart file with wrong bin

[John Kehayias]

Hello again,

I should have sent this here directly, but I just submitted a patch for this 
issue. I opted to just use a plain exec line of "syncthing-gtk". Please see 
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=53036

As we had discussed, it is not perfect, but it will work and won't break on a 
store path change. I think the chance of conflicting/multiple versions of 
syncthing-gtk is rare and not worth worrying about over this not working at all 
(syncthing-gtk is just a simple frontend to the web interface of the real 
syncthing, after all). We can work on a more robust autostart in Guix with guix 
home for a future system to wrangle all this better.

Thanks,
John