[gnumeric] Really destroy sheet order dialog.

[Jean Bréfort <jbrefort src gnome org>]

commit 7abcfc967b8e9603638ecb69da017ba1cb2a29b5
Author: Jean Brefort <jean brefort normalesup org>
Date:   Fri Nov 5 22:27:21 2010 +0100

    Really destroy sheet order dialog.

 src/dialogs/ChangeLog            |    5 +++++
 src/dialogs/dialog-sheet-order.c |    6 ++++++
 2 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/src/dialogs/ChangeLog b/src/dialogs/ChangeLog
index bb54590..fe7b82e 100644
--- a/src/dialogs/ChangeLog
+++ b/src/dialogs/ChangeLog
@@ -1,3 +1,8 @@
+2010-11-05  Jean Brefort  <jean brefort normalesup org>
+
+	* dialog-sheet-order.c (destroy_cb), (dialog_sheet_order): clear state on
+	destroy.
+
 2010-11-05  Morten Welinder  <terra gnome org>
 
 	* dialog-about.c: Celebrate dead kittens.
diff --git a/src/dialogs/dialog-sheet-order.c b/src/dialogs/dialog-sheet-order.c
index 40539f9..604d15b 100644
--- a/src/dialogs/dialog-sheet-order.c
+++ b/src/dialogs/dialog-sheet-order.c
@@ -1413,6 +1413,11 @@ cb_adv_check_toggled (G_GNUC_UNUSED GtkToggleButton *ignored,
 	gtk_tree_view_column_set_visible (state->row_max_column, visible);
 }
 
+static void
+destroy_cb (GObject *obj)
+{
+	g_object_set_data (obj, "state", NULL);
+}
 
 void
 dialog_sheet_order (WBCGtk *wbcg)
@@ -1548,6 +1553,7 @@ dialog_sheet_order (WBCGtk *wbcg)
 	wbc_gtk_attach_guru (state->wbcg, GTK_WIDGET (state->dialog));
 	g_object_set_data_full (G_OBJECT (state->dialog),
 		"state", state, (GDestroyNotify) cb_sheet_order_destroy);
+	g_signal_connect (G_OBJECT (state->dialog), "destroy", G_CALLBACK (destroy_cb), NULL);
 
 	gnumeric_restore_window_geometry (GTK_WINDOW (state->dialog),
 					  SHEET_ORDER_KEY);