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Backport the implementation of gtk_list_store_iter_is_valid from gtk+-3.
Index: gtk+-2.24.33/gtk/gtkliststore.c
===================================================================
--- gtk+-2.24.33.orig/gtk/gtkliststore.c
+++ gtk+-2.24.33/gtk/gtkliststore.c
@@ -1195,16 +1195,31 @@ gboolean
gtk_list_store_iter_is_valid (GtkListStore *list_store,
GtkTreeIter *iter)
{
+ GSequenceIter *seq_iter;
+
g_return_val_if_fail (GTK_IS_LIST_STORE (list_store), FALSE);
g_return_val_if_fail (iter != NULL, FALSE);
- if (!VALID_ITER (iter, list_store))
- return FALSE;
+ /* can't use VALID_ITER() here, because iter might point
+ * to random memory.
+ *
+ * We MUST NOT dereference it.
+ */
- if (g_sequence_iter_get_sequence (iter->user_data) != list_store->seq)
+ if (iter == NULL ||
+ iter->user_data == NULL ||
+ list_store->stamp != iter->stamp)
return FALSE;
- return TRUE;
+ for (seq_iter = g_sequence_get_begin_iter (list_store->seq);
+ !g_sequence_iter_is_end (seq_iter);
+ seq_iter = g_sequence_iter_next (seq_iter))
+ {
+ if (seq_iter == iter->user_data)
+ return TRUE;
+ }
+
+ return FALSE;
}
static gboolean real_gtk_list_store_row_draggable (GtkTreeDragSource *drag_source,
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