anchor.diff:    barModule = types.submodule {
       options = {
         inherit (commonOptions) fonts;
  +
  +      extraConfig = mkOption {
  +        type = types.lines;
  +        default = "";
  +        description = "Extra configuration lines for this bar.";
  +      };
   
         id = mkOption {
           type = types.nullOr types.string;
  
positive.code: 
    barStr = {
      id, fonts, mode, hiddenState, position, workspaceButtons,
      workspaceNumbers, command, statusCommand, colors, trayOutput, ...
    }: ''
      bar {
        ${optionalString (id != null) "id ${id}"}
  
negative.code:         urgent_workspace ${barColorSetStr colors.urgentWorkspace}
          binding_mode ${barColorSetStr colors.bindingMode}
        }
        ${extraConfig}
      }
    '';
  
  