[hidpi] DnD issues (cannot DnD from JFileChooser to JEditorPane or other text component) when scale > 1

Please compile/run the attached DnD test (JChooserTest.java)

When running on the regular display - no issues occur. the user can drag files from chooser to taret (red) and see the event log.

if set -Dsun.java2d.uiScale=2 or use HiDPI display, that cannot be done (NOK)

Win 7, 8 / JDK9 b104 / b105 nightly