Any AWT frames redraw containing components incorrectly. The redrawing area has the same borders as it was at the moment when the frame was shown.

TEST CASE:
//========================= SimpleFrame.java
import java.awt.*;

class SimpleFrame extends Frame {

    private SimpleFrame () {
        add(new Button("Press me"));
        pack();
        setVisible(true);
    }

    public static void main(String[] args) {
        new SimpleFrame();
    }
}
//========================= End of SimpleFrame.java

JAVA VERSION:

java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b26)
OpenJDK Client VM (build 12.0-b03, mixed mode)