Ok, discussing this with John, it turns out an app can choose arbitrary
sounds in the push-helper. So to minimize the security implications it
might be a good idea to keep the restriction on XDG_DATA_DIR. Instead,
/custom/ should be added to the XDG_DATA_DIR paths. In case we ever want
to allow the user setting his custom sound file for ringtones, we'd need
to hardlink/copy it to ~/.local/share first.

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https://bugs.launchpad.net/bugs/1413818

Title:
  Notification sounds aren't being played back on E4.5

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