Description Attila Török 2019-07-29 07:19:11 EDT

When running the following code fragment in rapid succession (in a PaintListener for example):

     Image image = new Image(Display.getCurrent(), 100, 100);
     GC imageGC = new GC(image);

     Transform transform = new Transform(imageGC.getDevice());
     transform.translate(10, 10);
     imageGC.setTransform(transform);
     imageGC.setClipping(20, 20, 30, 30);
     SWTGraphics g = new SWTGraphics(imageGC);
     Rectangle r = new Rectangle();
     g.getClip(r);
     System.out.println(r.toString());

The printed rectangle randomly oscillates between two values:

Rectangle(20.0, 20.0, 30.0, 30.0)
Rectangle(20.0, 20.0, 10.0, 30.0)

It looks like some sort of a race condition.
The graphics painted onto the Image through g are also incorrectly clipped most of the time.
Manually overwriting the clipping on the SWTGraphics after it is constructed solves the issue:

    g.setClip(new Rectangle(20, 20, 30, 30));