When a component changes its background, the Motif awt peers incorrectly
propagates the background change to all child windows. Instead, it should
only propagate to ones that did not specify a background explicitly and
inherited their background from the changed parent.

Reproduce by:

import java.awt.*;
import java.applet.*;

class MyCanvas extends Canvas {
    public void paint(Graphics g) {
    }

    public void update(Graphics g) {
    }
}

public class BG extends Applet {

    public void init() {
setLayout(null);
resize(300, 300);

Canvas c1 = new MyCanvas();
add(c1);
c1.reshape(20, 20, 40, 40);

Canvas c2 = new MyCanvas();
add(c2);
c2.reshape(240, 240, 40, 40);

c1.setBackground(Color.red);
c2.setBackground(Color.blue);

    }

    public boolean handleEvent(Event e) {

if (e.id == Event.MOUSE_DOWN) {
setBackground(Color.yellow);
return true;
}
return false;
    }
}

This is available for a while as http://wombat.eng/~rberlin/BG.html

The applet correctly comes up with red and blue squares on a gray background.
Click anywhere in the applet and it will all go yellow, including the
child canvases.

This was reproduced with a current (minus a few days) JDK1.1 workspace
and appletviewer.

By no-oping the paint and update methods, we can see what color the
window system is painting the windows on expose.

I tried this on a 1.0.1 Win32s platform and got the correct behaviour
(ignoring the effects of bug 1246765, which also affects backgrounds).

[2 May 96 a]