anchor.diff:        "${optionalString (prefixKey != null) "${prefixKey}+"}k" = upCmd;
         "${optionalString (prefixKey != null) "${prefixKey}+"}l" = rightCmd;
       };
  -  mapDirectionDefault = { prefixKey, prefixCmd }:
  +  mapDirectionDefault = { prefixKey ? null, prefixCmd }:
       (mapDirection {
         inherit prefixKey;
         leftCmd = "${prefixCmd} left";
  
positive.code:       upCmd = "${prefixCmd} up";
        rightCmd = "${prefixCmd} right";
      });
  
  in {
    xsession.windowManager.i3 = {
  
negative.code:   # Aliases
    alt = "Mod1";
    modifier = "Mod4";
    workspaces = [
      { ws = 1; name = "1:  "; }
      { ws = 2; name = "2:  "; }
      { ws = 3; name = "3:  "; }
      { ws = 4; name = "4:  "; }
      { ws = 5; name = "5:  "; }
      { ws = 6; name = "6:  "; }
      { ws = 7; name = "7:  "; }
      { ws = 8; name = "8:  "; }
      { ws = 9; name = "9:  "; }
      { ws = 0; name = "10:  "; }
    ];
  
    # Theme
    mainFont = "Roboto";
  