[gtk+] scrolledwindow: Add motion mask to the widget window

[Carlos Garnacho <carlosg src gnome org>]

commit 1feaa6f30193b0d496e73421af967273d0af0682
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon Mar 2 15:31:11 2015 +0100

    scrolledwindow: Add motion mask to the widget window
    
    This is not specified specifically by the attached controllers, so let
    the scrolledwindow set the mask, as motion events with no buttons pressed
    are interesting to it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=745344

 gtk/gtkscrolledwindow.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index dbc0f15..893a1ac 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -4041,7 +4041,7 @@ gtk_scrolled_window_realize (GtkWidget *widget)
   attributes.visual = gtk_widget_get_visual (widget);
   attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
   attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK |
-    GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK;
+    GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK | GDK_POINTER_MOTION_MASK;
 
   window = gdk_window_new (gtk_widget_get_parent_window (widget),
                            &attributes, attributes_mask);