Avoid wasting bandwidth to set user time

* src/xterm.c (x_display_set_last_user_time): Don't change the
user time property if nothing actually changed.

1 files changed, 9 insertions, 2 deletions

diff --git a/src/xterm.c b/src/xterm.c
index e6b098f8830..1e9161c7ab0 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -7157,7 +7157,11 @@ x_display_set_last_user_time (struct x_display_info *dpyinfo, Time time,
                               bool send_event)
 {
 #ifndef USE_GTK
-  struct frame *focus_frame = dpyinfo->x_focus_frame;
+  struct frame *focus_frame;
+  Time old_time;
+
+  focus_frame = dpyinfo->x_focus_frame;
+  old_time = dpyinfo->last_user_time;
 #endif
 
 #ifdef ENABLE_CHECKING
@@ -7168,8 +7172,11 @@ x_display_set_last_user_time (struct x_display_info *dpyinfo, Time time,
     dpyinfo->last_user_time = time;
 
 #ifndef USE_GTK
-  if (focus_frame)
+  /* Don't waste bandwidth if the time hasn't actually changed.  */
+  if (focus_frame && old_time != dpyinfo->last_user_time)
     {
+      time = dpyinfo->last_user_time;
+
       while (FRAME_PARENT_FRAME (focus_frame))
         focus_frame = FRAME_PARENT_FRAME (focus_frame);