use shortcut manager for the main help menu * main_window.cc (add_action): new parameter for the signal receiver; (construct_help_menu): use add_action for the actions of the menu; (construct_documentation_menu): use add_action for the actions of the menu; (set_global_shortcuts): set/unset shortcuts * main-window.h: actions are class variables, add_action with new parameter * shortcut-manager.cc (do_init_data): initialize the shortcuts in the help menu

((nil .
      ((c-file-style . "gnu")
       (indent-tabs-mode . nil)
       (fill-column . 72)
       (eval . (when (and (buffer-file-name)
                          (string-match-p "\\.h\\'" (buffer-file-name))
                          (not (string-match-p "/gnulib/" (buffer-file-name))))
                 (c++-mode)
                 (c-set-style "gnu")))))
 (change-log-mode . ((indent-tabs-mode . t)))
 (makefile-mode . ((indent-tabs-mode . t))))