# Rationale:
#   Most of the time time_out_lock_countdown_update() calls
#   time_out_lock_screen_set_remaining() with arguments that are incompatible
#   with gtk_progress_bar (resulting fraction to be set on the progress bar
#   can range from infinity through zero to a number > 1), which in turn leads
#   to GTK errors on stderr every second.
#
# Patch:
#   Check for occurrences of such conditions and as these imply that the lock
#   progress bar is hidden anyway, do not update it.
diff -Ndpru10 xfce4-time-out-plugin-1.0.0/panel-plugin/time-out-lock-screen.c xfce4-time-out-plugin-1.0.0.new/panel-plugin/time-out-lock-screen.c
--- xfce4-time-out-plugin-1.0.0/panel-plugin/time-out-lock-screen.c	2010-12-06 17:34:50.000000000 +0100
+++ xfce4-time-out-plugin-1.0.0.new/panel-plugin/time-out-lock-screen.c	2011-05-25 14:03:13.884840608 +0200
@@ -320,22 +320,25 @@ time_out_lock_screen_set_remaining (Time
   /* Get long string representation of the remaining time */
   time_string = time_out_countdown_seconds_to_string (seconds, lock_screen->display_seconds, lock_screen->display_hours, FALSE);
   
   /* Add markup */
   g_string_prepend (time_string, "<span size=\"x-large\">");
   g_string_append (time_string, "</span>");
   
   /* Update widgets */
   gtk_label_set_markup (GTK_LABEL (lock_screen->time_label), time_string->str);
 
-  gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (lock_screen->progress),
-                                 ((gdouble)seconds) / ((gdouble)lock_screen->max_seconds));
+  if ((0 < lock_screen->max_seconds) && (0 <= seconds) && (seconds <= lock_screen->max_seconds))
+  {
+    gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (lock_screen->progress),
+                                   ((gdouble)seconds) / ((gdouble)lock_screen->max_seconds));
+  }
 
   /* Free time string */
   g_string_free (time_string, TRUE);
 }
 
 
 
 void
 time_out_lock_screen_set_allow_postpone (TimeOutLockScreen *lock_screen,
                                          gboolean           allow_postpone)