[gtk+/smooth-scrolling-for-3.4: 20/20] scalebutton: Set GDK_SCROLL_MASK explicitly

[Carlos Garnacho <carlosg src gnome org>]

commit 3d1f0ee517a020db228b76cb683c67b1ee2e4b5b
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Feb 23 14:47:13 2012 +0100

    scalebutton: Set GDK_SCROLL_MASK explicitly
    
    selecting for button press/release doesn't suffice anymore to
    get scroll events.

 gtk/gtkscalebutton.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkscalebutton.c b/gtk/gtkscalebutton.c
index 54765e6..a72b315 100644
--- a/gtk/gtkscalebutton.c
+++ b/gtk/gtkscalebutton.c
@@ -417,6 +417,8 @@ gtk_scale_button_init (GtkScaleButton *button)
   /* the scale */
   priv->scale = gtk_scale_button_scale_new (button);
   gtk_container_add (GTK_CONTAINER (priv->box), priv->scale);
+
+  gtk_widget_add_events (GTK_WIDGET (button), GDK_SCROLL_MASK);
 }
 
 static GObject *