Attempt to solve bug #17497 by minimizing cursor motion during TTY menu updates.

 src/term.c (tty_menu_display): Don't position cursor here.  Instead,
 pass the cursor coordinates to update_frame_with_menu.
 (tty_menu_activate): Send the hide cursor command only once in an
 iteration through the outer 'while' loop.
 src/dispnew.c (update_frame_1): Accept an additional argument
 SET_CURSOR_P, and position the cursor at the end of the frame
 update only if that argument is non-zero.  All callers changed to
 provide the additional argument as non-zero, except for
 update_frame_with_menu.
 (update_frame_with_menu): Accept 2 additional arguments ROW and
 COL; if they are non-negative, instruct update_frame_1 not to
 position the cursor, and instead position it according to ROW and
 COL.
 src/dispextern.h (update_frame_with_menu): Update prototype.

1 files changed, 20 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 5759d155580..16e3328a735 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,23 @@
+2014-06-04  Eli Zaretskii  <eliz@gnu.org>
+
+        Minimize cursor motion during TTY menu updates.
+        * term.c (tty_menu_display): Don't position cursor here.  Instead,
+        pass the cursor coordinates to update_frame_with_menu.
+        (tty_menu_activate): Send the hide cursor command only once in an
+        iteration through the outer 'while' loop.
+
+        * dispnew.c (update_frame_1): Accept an additional argument
+        SET_CURSOR_P, and position the cursor at the end of the frame
+        update only if that argument is non-zero.  All callers changed to
+        provide the additional argument as non-zero, except for
+        update_frame_with_menu.
+        (update_frame_with_menu): Accept 2 additional arguments ROW and
+        COL; if they are non-negative, instruct update_frame_1 not to
+        position the cursor, and instead position it according to ROW and
+        COL.
+
+        * dispextern.h (update_frame_with_menu): Update prototype.
+
 2014-06-02  Stefan Monnier  <monnier@iro.umontreal.ca>
 
         * callproc.c (call_process): Don't check read-only if we don't insert