efa27d33cf
The default session might be found in `extraSessionFilePackages`, but it's not viable to detect at evaluation time, so emit a warning. In LightDM instead of checking `defaultSessionName` against `displayManager.session.names` we rely on the assertions in `desktopManager` and `windowMananger` and just check that there's at least one default set. The second assertion could never actually be triggered.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.