Tells the container that the object.no longer has any undo state and that the
container should not call IOleInPlaceObject::ReActivateAndUndo.
The method completed successfully.
An unexpected error occurred.
If an object is activated in place and the object's associated object
application maintains only one level of undo, there is no need to have more than one
entry on the undo stack. That is, once a change has been made to the active
object that invalidates its undo state saved by the container, there is no need to
maintain this undo state in the container.
Notes to Callers
IOleInPlaceSite::DiscardUndoState is called by the active object while performing some action that would
discard the undo state of the object. The in-place object calls this method to notify
the container to discard the object's last saved undo state.
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