[gtk+] scrolledwindow: Only render overshoot on the widget window

[Carlos Garnacho <carlosg src gnome org>]

commit e0353b37a83d1c6aeb22b6880079df74e322b3c1
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Nov 13 20:18:54 2014 +0100

    scrolledwindow: Only render overshoot on the widget window
    
    Without any check, it was being rendered also on the indicator
    GdkWindows, which resulted on an over-exposed effect there.

 gtk/gtkscrolledwindow.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 5a0b410..8ea03d5 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -1884,7 +1884,8 @@ gtk_scrolled_window_draw (GtkWidget *widget,
       gtk_cairo_should_draw_window (cr, priv->vindicator.window))
     gtk_container_propagate_draw (GTK_CONTAINER (scrolled_window), priv->vscrollbar, cr);
 
-  gtk_scrolled_window_draw_overshoot (scrolled_window, cr);
+  if (gtk_cairo_should_draw_window (cr, gtk_widget_get_window (widget)))
+    gtk_scrolled_window_draw_overshoot (scrolled_window, cr);
 
   return FALSE;
 }