emacs-synchronized-updates.patch

emacs-synchronized-updates.patch

diff --git a/src/term.c b/src/term.c
index 0858f81685..4e6c134acf 100644
--- a/src/term.c
+++ b/src/term.c
@@ -227,7 +227,14 @@ tty_reset_terminal_modes (struct terminal *terminal)
     }
 }
 
-/* Flag the end of a display update on a termcap terminal. */
+static void
+tty_update_begin (struct frame *f)
+{
+  struct tty_display_info *tty = FRAME_TTY (f);
+
+  fputs ("\033P=1s\033\\", tty->output);
+  fflush (tty->output);
+}
 
 static void
 tty_update_end (struct frame *f)
@@ -239,6 +246,9 @@ tty_update_end (struct frame *f)
   tty_turn_off_insert (tty);
   tty_background_highlight (tty);
   fflush (tty->output);
+
+  fputs ("\033P=2s\033\\", tty->output);
+  fflush (tty->output);
 }
 
 /* The implementation of set_terminal_window for termcap frames. */
@@ -3862,6 +3872,7 @@ set_tty_hooks (struct terminal *terminal)
   terminal->ring_bell_hook = &tty_ring_bell;
   terminal->reset_terminal_modes_hook = &tty_reset_terminal_modes;
   terminal->set_terminal_modes_hook = &tty_set_terminal_modes;
+  terminal->update_begin_hook = &tty_update_begin;
   terminal->update_end_hook = &tty_update_end;
 #ifdef MSDOS
   terminal->menu_show_hook = &x_menu_show;