[rhythmbox] header: remove left-click workaround for gtk+ 3.5+ (bug #678923)

[Jonathan Matthew <jmatthew src gnome org>]

commit a16a8bb41090233a28778e45f277e94de091f773
Author: Jonathan Matthew <jonathan d14n org>
Date:   Wed Jun 27 13:04:44 2012 +1000

    header: remove left-click workaround for gtk+ 3.5+ (bug #678923)
    
    GtkScale has the right behaviour now.  Keep the workaround for
    older versions.

 widgets/rb-header.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/widgets/rb-header.c b/widgets/rb-header.c
index b5e8e7a..eeb4510 100644
--- a/widgets/rb-header.c
+++ b/widgets/rb-header.c
@@ -875,12 +875,14 @@ slider_press_callback (GtkWidget *widget,
 	header->priv->latest_set_time = -1;
 	g_object_notify (G_OBJECT (header), "slider-dragging");
 
+#if !GTK_CHECK_VERSION(3,5,0)
 	/* HACK: we want the behaviour you get with the middle button, so we
 	 * mangle the event.  clicking with other buttons moves the slider in
 	 * step increments, clicking with the middle button moves the slider to
 	 * the location of the click.
 	 */
 	event->button = 2;
+#endif
 
 
 	return FALSE;
@@ -948,8 +950,10 @@ slider_release_callback (GtkWidget *widget,
 			 GdkEventButton *event,
 			 RBHeader *header)
 {
+#if !GTK_CHECK_VERSION(3,5,0)
 	/* HACK: see slider_press_callback */
 	event->button = 2;
+#endif
 
 	if (header->priv->slider_dragging == FALSE) {
 		rb_debug ("slider is not dragging");