[gtksourceview] source-map: be resilient against non-existent windows

[Christian Hergert <chergert src gnome org>]

commit 0f0a3e94e7948d0abdd7ef08341809106e544b44
Author: Christian Hergert <christian hergert me>
Date:   Fri May 22 09:30:31 2015 -0700

    source-map: be resilient against non-existent windows
    
    This could happen before realize, for example.

 gtksourceview/gtksourcemap.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/gtksourceview/gtksourcemap.c b/gtksourceview/gtksourcemap.c
index dae2ec0..53c5b09 100644
--- a/gtksourceview/gtksourcemap.c
+++ b/gtksourceview/gtksourcemap.c
@@ -238,8 +238,11 @@ update_scrubber_position (GtkSourceMap *map)
                 * were when drawing the scrubber from a parent widget.
                 */
                window = gtk_text_view_get_window (GTK_TEXT_VIEW (map), GTK_TEXT_WINDOW_WIDGET);
-               gdk_window_invalidate_rect (window, &priv->scrubber_area, FALSE);
-               gdk_window_invalidate_rect (window, &scrubber_area, FALSE);
+               if (window != NULL)
+               {
+                       gdk_window_invalidate_rect (window, &priv->scrubber_area, FALSE);
+                       gdk_window_invalidate_rect (window, &scrubber_area, FALSE);
+               }
 
                priv->scrubber_area = scrubber_area;
        }