When window translucency is enabled for windows with accelerated
surfaces the tranlucency doesn't work well on Windows systems
prior to Windows Vista: there are artifacts when a window is dragged
away, and it doesn't appear transparent.

Shaped windows work fine.
To run the attached test:
   java -Dusetrans TranslucencySwingTest
   java -Dusetrans -Duseshape TranslucencySwingTest
   java -Duseswing -Dusetrans TranslucencySwingTest
   java -Duseswing -Dusetrans -Duseshape TranslucencySwingTest
and so on. Same with opengl pipeline enabled..