[gtk+] gdkwindow: Fix list_insert_link_before

[Alexander Larsson <alexl src gnome org>]

commit ee883a2ef57f675ad70ddee94355157e48ddfb89
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Sep 21 16:58:41 2015 +0200

    gdkwindow: Fix list_insert_link_before
    
    We forgot to set prev->next to the new link

 gdk/gdkwindow.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index 89ed898..2f7ee2d 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -267,6 +267,9 @@ list_insert_link_before (GList *list,
       link->prev = sibling->prev;
       sibling->prev = link;
 
+      if (link->prev)
+        link->prev->next = link;
+
       return list;
     }
 }