[BUG] : Create shortcut button issues on Linux Flatpak

[ImSapphire]

Issue encountered

The Flatpak is missing rw permissions on xdg-desktop (for non-Steam shortcuts) and ~/.steam/steam/userdata (for Steam shortcuts), so creating shortcuts fails.
After adding these permissions, the created shortcuts don't work since the Exe and StartDir are not correct

Expected Behavior

No response

Steps to Reproduce

No response

Operating System

Linux

Version

1.5.0-alpha.8

Additional Context

Permission issues:

17:12:32.994 › Error: EROFS: read-only file system, open '/home/sapphire/.steam/steam/userdata/1567182911/config/shortcuts.vdf'
17:16:58.226 › Error: EROFS: read-only file system, open '/home/sapphire/Desktop/Beat Saber 1.40.0 DLC.desktop' EROFS null

Shortcut data:

17:14:45.781 › Shortcut created {
  AppName: 'Beat Saber 1.40.0 DLC',
  Exe: '/app/lib/io.bsmanager.bsmanager/bs-manager',
  StartDir: '/app/lib/io.bsmanager.bsmanager',
  LaunchOptions: 'bsmanager://launch?version=1.40.0&versionName=DLC&versionIno=8191312',
  icon: '/home/sapphire/.var/app/io.bsmanager.bsmanager/config/bs-manager/CachedData/imagescache/launch_shortcut_#9C45FF.png',
  OpenVR: '\x01'
}

The correct 'StartDir' for system Flatpak installation should be '/var/lib/flatpak/app/io.bsmanager.bsmanager/current/active/files/lib/io.bsmanager.bsmanager', Exe should be '/var/lib/flatpak/app/io.bsmanager.bsmanager/current/active/files/lib/io.bsmanager.bsmanager/bs-manager'

[silentrald]

Duplicate of #738

@ImSapphire Can you check if you could change the desktop exec to flatpak run io.io.bsmanager to check if that works, remove the startdir as well. I'm not sure if I could pull the custom pathing for your flatpak or you installs that easy without manually telling BSManager the path.

[ImSapphire]

@silentrald The file /.flatpak-info in the sandbox has information about where the flatpak is installed, you could grab the path from there
.flatpak-info