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--- gnome-canvas.c 2011-01-31 07:19:30.000000000 -0500
+++ ../../../libgnomecanvas-2.30.3/libgnomecanvas/gnome-canvas.c 2012-11-19 13:10:20.552383069 -0500
@@ -75,6 +75,7 @@
#include <config.h>
+#include <sys/time.h>
#include <math.h>
#include <string.h>
#include <stdio.h>
@@ -3202,16 +3203,34 @@
idle_handler (gpointer data)
{
GnomeCanvas *canvas;
+ struct timeval enter, leave, diff;
GDK_THREADS_ENTER ();
canvas = GNOME_CANVAS (data);
+ gettimeofday (&enter, NULL);
do_update (canvas);
+ gettimeofday (&leave, NULL);
- /* Reset idle id */
+ /* Reset idle id*/
canvas->idle_id = 0;
+ timersub (&leave, &enter, &diff);
+
+ /* GnomeCanvas can be REALLY REALLY slow at updating/recomputing
+ * lines. During motion handling this can lead to situations where the
+ * next motion event arrives before the update is complete, and
+ * as a result, GTK never gets to run the redraw/expose cycle.
+ *
+ * This cannot be fixed until we replace the canvas, so for
+ * force an actual redraw
+ */
+
+ if (diff.tv_sec > 0 || diff.tv_usec > 30000) {
+ gdk_window_process_updates (canvas->layout.bin_window, 1);
+ }
+
GDK_THREADS_LEAVE ();
return FALSE;
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