Removal of discarded inventory offers moved to deferred (idle) tick. Nested gInventory.notifyObservers() don't work.

indra/newview/llinventorymodel.h

@@ -343,6 +343,7 @@ public:
 	// consistent internal state. No cache accounting, observer
 	// notification, or server update is performed.
 	void deleteObject(const LLUUID& id);
+	void removeItem(const LLUUID& item_id);
 	
 	// Delete a particular inventory object by ID, and delete it from
 	// the server. Also updates linked items.