[gimp] Set handler variables to NULL after disconnecting them

[Michael Natterer <mitch src gnome org>]

commit 1b806e5fb60ede5a9d7b53e5d79e1c8fb732f930
Author: Michael Natterer <mitch gimp org>
Date:   Tue Aug 4 22:43:53 2009 +0200

    Set handler variables to NULL after disconnecting them

 app/display/gimpdisplayshell-handlers.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/app/display/gimpdisplayshell-handlers.c b/app/display/gimpdisplayshell-handlers.c
index 20467fc..8e572f8 100644
--- a/app/display/gimpdisplayshell-handlers.c
+++ b/app/display/gimpdisplayshell-handlers.c
@@ -321,8 +321,13 @@ gimp_display_shell_disconnect (GimpDisplayShell *shell)
                                         shell);
 
   gimp_tree_handler_disconnect (shell->vectors_visible_handler);
+  shell->vectors_visible_handler = NULL;
+
   gimp_tree_handler_disconnect (shell->vectors_thaw_handler);
+  shell->vectors_thaw_handler = NULL;
+
   gimp_tree_handler_disconnect (shell->vectors_freeze_handler);
+  shell->vectors_freeze_handler = NULL;
 
   g_signal_handlers_disconnect_by_func (image,
                                         gimp_display_shell_profile_changed_handler,