fix listener add/remove issue

core/src/processing/core/PApplet.java

@@ -2114,8 +2114,18 @@ public class PApplet extends Applet
     comp.removeMouseMotionListener(this);
     comp.removeKeyListener(this);
     comp.removeFocusListener(this);
-
   }
+  
+
+  /** 
+   * Call to remove, then add, listeners to a component. 
+   * Avoids issues with double-adding. 
+   */
+  public void updateListeners(Component comp) {
+    removeListeners(comp);
+    addListeners(comp);
+  }
+  
 
   //////////////////////////////////////////////////////////////
 

core/src/processing/core/PGraphicsJava2D.java

@@ -139,7 +139,7 @@ public class PGraphicsJava2D extends PGraphics /*PGraphics2D*/ {
 //      parent.addListeners(canvas);
 ////      canvas.createBufferStrategy(1);
 //      g2 = (Graphics2D) canvas.getGraphics();
-      parent.addListeners(parent);
+      parent.updateListeners(parent);  // in case they're already there
 
       // Needs to be RGB otherwise there's a major performance hit [0204]
       // http://code.google.com/p/processing/issues/detail?id=729