Description
This patch fixes a quite annoying bug in OLE32 drag'n'drop implementation, where cursor was "bliking" during drag'n'drop operation.
This was caused by wrong mouse coordinates set by WM_TIMER messages, and passed to PointToWindow function which was returning a null hWnd, and drag'n'drop main loop detected a window change that didn't happen.
Anyways, investigation should be done to see if WM_TIMER message should contain valid values for pt field in its MSG structure.