Incorrect result effect for drag-and-drop via rmb

[nikita-leontiev]

Test: drag-and-drop to TE panel via right mouse button > select Move, Create link or Cancel.
Result: IDropTarget::Drop returns before the context menu opens i.e. operation selected and *pdwEffect is always set to Copy (1).
Expected: Move (2) for move, Link (4) for create link and None (0) for cancel. It's better to return DRAGDROP_S_CANCEL from IDropTarget::Drop in case of cancel.
Tablacus Explorer 26.5.12 64bit