Posted by Sven Gothel on May 14, 2012; 5:55am
URL: https://forum.jogamp.org/GLCanvas-draws-over-Swing-components-on-Mac-tp3973879p3985238.html

AFAIK this is related to OSX's >= 10.5.8 offscreen rendering (CALayer).

We provide an OpenGL rendered layer to the CALayer, which will be composed
by the Cocoa / Plugin parent.

This artifact is even visible with the Version Info Applet, as shown here:
  <http://jogamp.org/deployment/jogamp-current/jogl-applet-version-napplet.html>

Either we lack providing essential clipping information or similar data
or the CALayer composer for the Applet is buggy.

AFAIK our offscreen window is of the correct size .. maybe somebody
likes to digg into this ?