[gthumb/ext] update the sort order only if required

[Paolo Bacchilega <paobac src gnome org>]

commit 122c5ca4232e065fc52af23f2bdc1ce40396f90a
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sat Aug 29 11:09:38 2009 +0200

    update the sort order only if required

 gthumb/gth-file-store.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gthumb/gth-file-store.c b/gthumb/gth-file-store.c
index 753ad6b..242e817 100644
--- a/gthumb/gth-file-store.c
+++ b/gthumb/gth-file-store.c
@@ -1101,6 +1101,9 @@ gth_file_store_set_sort_func (GthFileStore        *file_store,
 			      GthFileDataCompFunc  cmp_func,
 			      gboolean             inverse_sort)
 {
+	if ((cmp_func != file_store->priv->cmp_func) || (inverse_sort != file_store->priv->inverse_sort))
+		return;
+
 	file_store->priv->cmp_func = cmp_func;
 	file_store->priv->inverse_sort = inverse_sort;
 	_gth_file_store_reorder (file_store);