Portable configuration data

https://github.com/AppImage/AppImageKit/commit/d17fdefadcb98befa66c29137ce25731256f8f2a implements the following:

  • If there is a directory with the same name as the AppImage plus .home, then export $HOME.
  • If there is a directory with the same name as the AppImage plus .config, then export $XDG_CONFIG_HOME.

All new AppImages generated with the latest continuous build of appimagetool will have this functionality.

Depending on how well this works in practice, it may become part of the spec.

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