[NtUser]

[NtUser]
- Synchronize mouse messages. Part II
- Dedicated to Giannis Adamopoulos and Amine Khaldi.
- Additional fixes are added.
- This should be more accurate, based on "Hit Testing: Which HWND is the mouse over?":
http://blogs.msdn.com/b/dwayneneed/archive/2008/09/08/transparent-windows-in-wpf.aspx
- Note: Older FireFox menu item hilite select seem to work now, do not need to keep moving the mouse to keep it hilited to be selected.
- Test results: https://reactos.org/sites/all/modules/reactos/testman/compare.php?ids=33709,33710,33713

svn path=/trunk/; revision=65472