[evolution] EMFolderTreeModel: Avoid a potential refcount crash.

[Matthew Barnes <mbarnes src gnome org>]

commit 90e4a46478e5c39b51bfd36bc252c10e9cd60865
Author: Matthew Barnes <mbarnes redhat com>
Date:   Wed Aug 10 08:40:06 2011 -0400

    EMFolderTreeModel: Avoid a potential refcount crash.

 mail/em-folder-tree-model.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/mail/em-folder-tree-model.c b/mail/em-folder-tree-model.c
index eb6239e..bbf9dd5 100644
--- a/mail/em-folder-tree-model.c
+++ b/mail/em-folder-tree-model.c
@@ -1155,8 +1155,14 @@ em_folder_tree_model_remove_folders (EMFolderTreeModel *model,
 
 	gtk_tree_store_remove ((GtkTreeStore *) model, toplevel);
 
-	if (is_store)
+	/* Freeing the GtkTreeRowReference in the store info may finalize
+	 * the model.  Keep the model alive until the store info is fully
+	 * removed from the hash table. */
+	if (is_store) {
+		g_object_ref (model);
 		g_hash_table_remove (model->priv->store_index, si->store);
+		g_object_unref (model);
+	}
 
 	g_free (full_name);
 	g_free (uri);