Bug 507981 - respect gtk-alternative-button-order GtkSetting for the filechooser. r=karlt

widget/src/gtk2/nsFilePicker.cpp

@@ -434,6 +434,10 @@ nsFilePicker::Show(PRInt16 *aReturn)
                                   GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
                                   accept_button, GTK_RESPONSE_ACCEPT,
                                   NULL);
+  gtk_dialog_set_alternative_button_order(GTK_DIALOG(file_chooser),
+                                          GTK_RESPONSE_ACCEPT,
+                                          GTK_RESPONSE_CANCEL,
+                                          -1);
   if (mAllowURLs) {
     gtk_file_chooser_set_local_only(GTK_FILE_CHOOSER(file_chooser), FALSE);
   }