FlushGraphics(x, y, w, h) clash, who is correct?

Question

when using GameCanvas.setFullScreenMode(), GameCanvas.flushGraphics(x, y, w, h) is not working as intended, or at least there are 2 different schools of behavior, depending on the emulator:
Behavior #1, followed by:
- Sun WTK21 / DefaultColorPhone
- SonyEricson WTK2 / K700, Z1010 & co
- Motorola SDK v4.1 / V300/400/500 & co
Behavior #2, followed by:
- Nokia Series 60 (e.g Series_60_MIDP_SDK_2_1_Beta)
Surprisingly, the most "intuitive" behavior is #2, eventough behavior #1 is more popular!
Following is a minimal test case, set by default to the counter-intuitive Behavior #1 (to switch to the other behavior, see the comments...)
Any clues which school is correct?
n.b. this one should be tested on models with bigger displays than 128x128...
package simple_1;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.game.*;
public class Simple_1 extends MIDlet
  static final int W = 128;
  static final int H = 128;
  int x = W / 2, y = H / 2;
  boolean running;
  MyCanvas canvas;
  public void startApp()
    if (canvas == null)
      canvas = new MyCanvas();
      Display.getDisplay(this).setCurrent(canvas);
      canvas.start();
  public void pauseApp()
  public void destroyApp(boolean unconditional)
    if (canvas != null)
      canvas.stop();
  class MyCanvas extends GameCanvas implements Runnable
    MyCanvas()
      super(true);
    public synchronized void start()
      setFullScreenMode(true);
    protected void sizeChanged(int width, int height)
      if (!running)
        running = true;
        new Thread(this).start();
    public void run()
      // without a pause, getHeight() is not correct on Nokia's Series_60 emulators
      try
        Thread.sleep(1000);
      catch (InterruptedException e)
      int w = getWidth();
      int h = getHeight();
      int dx = (w - H) / 2;
      int dy = (h - H) / 2;
      Graphics g = getGraphics();
      g.setColor(0x808080);
      g.fillRect(0, 0, w, h);
      flushGraphics();
      while (running)
        g.setColor(0xffffff);
        g.fillRect(0, 0, W, H);          // Behavior #1
        //g.fillRect(dx, dy, W, H);     // Behavior #2, TRY ME INSTEAD!
        x = (x + 1) % W;
        y = (y + 1) % H;
        g.setColor(0xff0000);
        g.fillRect(x, y, 4, 4);               // Behavior #1
        //g.fillRect(dx + x, dy + y, 4, 4);     // Behavior #2, TRY ME INSTEAD!
        flushGraphics(dx, dy, W, H);
        try
          Thread.sleep(10);
        catch (InterruptedException e)
    public void stop()
      running = false;
}

Answer 1

another hint, confirming the idea that Behavior #2 is problematic:
with Sun WTK21/DefaultColorPhone, or with SonyEricsson K700, Z1010 emulators, when you pause the application (using the top menu), then when you resume: display is broken!