optionall disable redisplay in command editor clear screen function * oct-rl-edit.c (octave_rl_clear_screen): Likewise. If skip_redisplay is true, override rl_redisplay_function. Otherwise, just call rl_clear_screen. * cmd-edit.h, cmd-edit.cc (command_editor::clear_screen, command_editor::do_clear_screen, gnu_readline::do_clear_screen): New arg, skip_redisplay. * sysdep.cc (Fclc): Pass true to command_editor::clear_screen.

--- a/libinterp/interpfcn/sysdep.cc	Wed Apr 17 17:59:04 2013 -0400
+++ b/libinterp/interpfcn/sysdep.cc	Thu Apr 18 02:02:59 2013 -0400
@@ -523,7 +523,9 @@
 Clear the terminal screen and move the cursor to the upper left corner.\n\
 @end deftypefn")
 {
-  command_editor::clear_screen ();
+  bool skip_redisplay = true;
+
+  command_editor::clear_screen (skip_redisplay);
 
   return octave_value_list ();
 }