The commit adds additional attributes to the black windows in order to correctly
link to the close / zoom / maximize buttons. This is needed to get some
tools using this api to work, in particular / e.g. jitouch.
(cherry picked from commit 73b270549bb441dd2f273f93d492239b459f1513)
Signed-off-by: David Fuhrmann <david.fuhrmann@googlemail.com>