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--- gdm-2.23.92/gui/simple-greeter/gdm-option-widget.c	2008-08-26 15:03:59.000000000 -0400
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+++ foo/gui/simple-greeter/gdm-option-widget.c	2008-09-19 09:57:30.000000000 -0400
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@@ -148,7 +148,8 @@
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         model = GTK_TREE_MODEL (widget->priv->list_store);
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         item_id = NULL;
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-        if (widget->priv->active_row == NULL) {
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+        if (widget->priv->active_row == NULL ||
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+            !gtk_tree_row_reference_valid (widget->priv->active_row)) {
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                 return NULL;
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         }
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