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 (stringdemo, args, , "String Demo")
{
  octave_value_list retval;
  int nargin = args.length ();

  if (nargin != 1)
    print_usage ();
  else
    {
      charMatrix ch = args(0).char_matrix_value ();

      if (! error_state)
        {
          retval(1) = octave_value (ch, '\'');  // Single Quote String

          octave_idx_type nr = ch.rows ();
          for (octave_idx_type i = 0; i < nr / 2; i++)
            {
              std::string tmp = ch.row_as_string (i);
              ch.insert (ch.row_as_string (nr-i-1).c_str (), i, 0);
              ch.insert (tmp.c_str (), nr-i-1, 0);
            }
          retval(0) = octave_value (ch, '"');  // Double Quote String
        }
    }
  return retval;
}