remote use of app from flatpak, cannot open display

[Dan Hitt]

I installed flatpak on a guest vm (ubuntu 19.10) running on my regular
system (debian 10).

I installed gimp on the guest by
   flatpak install flathub org.gimp.GIMP

On the guest, i can run gimp by
   flatpak run org.gimp.GIMP

But, if i am on the host, and 'ssh -X' to the guest, when i try to run
gimp, i get the error 'Cannot open display:'

Note that i can run another program, xterm, from the guest with the display
on the host.  Also, i can run gimp remotely from another (real) box (but
not using flatpak).

So i suspect that 'flatpak run' is somehow concealing something from gimp.

Would appreciate any advice on how to get this path (running gimp through
flatpak on a vm making its display on the host) working.

Thanks!

dan
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