Configuration: Ubuntu 15.04 Linux + Unity + HiDPI (scaling factor = 2) + JDK9 b93

Please run the attached test.

Expected behavior (GNOME): see the attached screenshot LocationOK.png (please note that the left-top coordinates obtained with getLocation are correct).

Unity: erroneous behavior (see LocationNOK.png). Please note that the console output obtained with getLocation changes from run to run. Does not depend on Dialog's parent (null dialog, null frame, etc.)