[gtk+/smooth-scrolling: 16/16] viewport: set GDK_SMOOTH_SCROLL_MASK

[Carlos Garnacho <carlosg src gnome org>]

commit 7e47690b52fb7a0cf638ee8c3682d0240a1dec9c
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Jan 24 12:18:45 2012 +0100

    viewport: set GDK_SMOOTH_SCROLL_MASK
    
    This is so smooth scroll events are send/handled by the
    parent GtkScrolledWindow if any.

 gtk/gtkviewport.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkviewport.c b/gtk/gtkviewport.c
index 048d0f6..1560f09 100644
--- a/gtk/gtkviewport.c
+++ b/gtk/gtkviewport.c
@@ -679,7 +679,8 @@ gtk_viewport_realize (GtkWidget *widget)
   event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
   /* We select on button_press_mask so that button 4-5 scrolls are trapped.
    */
-  attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
+  attributes.event_mask = event_mask |
+    GDK_BUTTON_PRESS_MASK | GDK_SCROLL_MASK | GDK_SMOOTH_SCROLL_MASK;
 
   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;