[gtk+/gtk-3-10] Fix double-free introduced in f86dc163

[John Ralls <jralls src gnome org>]

commit 5c820fe22d7484f1f09ebe4c59491c1c5dde34d7
Author: John Ralls <jralls ceridwen us>
Date:   Fri Oct 11 10:40:26 2013 -0700

    Fix double-free introduced in f86dc163

 gtk/gtkdnd-quartz.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkdnd-quartz.c b/gtk/gtkdnd-quartz.c
index 1ec5db5..11a4855 100644
--- a/gtk/gtkdnd-quartz.c
+++ b/gtk/gtkdnd-quartz.c
@@ -1263,7 +1263,7 @@ gtk_drag_begin_internal (GtkWidget         *widget,
   window = [(id<GdkNSView>)[nswindow contentView] gdkWindow];
   g_return_val_if_fail (nsevent != NULL, NULL);
 
-  context = gdk_drag_begin (window, target_list->list);
+  context = gdk_drag_begin (window, g_list_copy (target_list->list));
   g_return_val_if_fail (context != NULL, NULL);
 
   info = gtk_drag_get_source_info (context, TRUE);