only single backup remains

pdex/src/processing/mode/experimental/DebugEditor.java

@@ -331,9 +331,10 @@ public class DebugEditor extends JavaEditor implements ActionListener {
      */
     @Override
     public void dispose() {
+        autosaver.shutDown();
         //System.out.println("window dispose");
         // quit running debug session
-        dbg.stopDebug();
+        dbg.stopDebug();        
         // remove var.inspector
         vi.dispose();
         errorCheckerService.stopThread();