Bug#948947: gnome-builder: fails to run built application

[Keyikedalube Ndang]

Found the solution!

Manually starting xdg-document-portal works; explained here https://github.com/flatpak/flatpak/issues/1359#issuecomment-455280209

systemctl start --user xdg-document-portal

Checking the service status, I noticed it was not running on fresh login. The current workaround is to manually start it.
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