fix conflict between main and editor menus when using alt keys (bug #42659) * file-editor.cc (enable_menu_shortcuts): new function enabling/disabling the alt-key accelerators; (m_add_menu): new function adding a menu and storing menu title with and without the char & indicating the accelerator in a hash; (construct): use m_add_menu for adding a new menu to the menu bar * file-editor-interface.h: new virtual function enable_menu_shortcuts * file-editor.h: new functions enable_menu_shortcuts amd m_add_menu, new hash for storing the menu titles * main-window.cc (connect_visibility_changed): disable editors menu shortcuts; (enable_menu_shortcuts): new function enabling/disabling the alt-key accelerators; (m_add_menu): new function adding a menu and storing menu title with and without the char & indicating the accelerator in a hash; (construct_file_menu, construct_edit_menu, construct_debug_menu, construct_window_menu, construct_help_menu, construct_news_menu): use m_add_menu for adding a new menu to the menu bar; (set_global_edit_shortcuts): enable/disable the main and the editors menu shortcuts

#include <octave/oct.h>

DEFUN_DLD (globaldemo, args, , "Global Demo")
{
  octave_value retval;
  int nargin = args.length ();

  if (nargin != 1)
    print_usage ();
  else
    {
      std::string s = args(0).string_value ();
      if (! error_state)
        {
          octave_value tmp = get_global_value (s, true);
          if (tmp.is_defined ())
            retval = tmp;
          else
            retval = "Global variable not found";

          set_global_value ("a", 42.0);
        }
    }
  return retval;
}