set current_dest_drag to NULL when destroying, fixes bug #120007. Also

set current_dest_drag to NULL when destroying, fixes bug #120007. Also

2004-02-28  Hans Breuer  <hans@breuer.org>

	* gdk/win32/gdkdnd-win32.c : set current_dest_drag to NULL
	when destroying, fixes bug #120007. Also removed the mirrored
	ref counting for deprecated gdk_drag_context_<ref|unref>()
	cause it wasn't reliable anymore anyway.

	* gdk/win32/gdkdisplay-win32.c : fix typo, which should
	have broken the win32 build for everyone not using msvc

	* gdk/win32/gdkevents-win32.c : WM_GETMINAMXINFO ensure not to
	return negative values for ptMaxTrackSize, it caused snapping
	windows to their minimum size