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

      subroutine mexFunction (nlhs, plhs, nrhs, prhs)

      implicit none

      integer*4 nlhs, nrhs

* The following will need to be integer*8 on 64-bit systems, otherwise
* these variables won't be large enough to hold pointers...
      integer*4 plhs(*), prhs(*)

      integer*4 mxIsString, mxGetString, mxGetN, mexCallMATLAB
      integer*4 status, len
      character*100 str

      call mexPrintf ('Hello, World!')

      if (nrhs .lt. 1 .or. mxIsString (prhs(1)) .ne. 1) then
        call mexErrMsgTxt ('function name expected')
      endif

      len = mxGetN (prhs(1))

      status = mxGetString (prhs(1), str, 100)

      call mexPrintf ('FORTRAN will call the interpreter now')

      status = mexCallMATLAB (nlhs, plhs, nrhs-1, prhs(2), str(1:len))

      return
      end