API GetQuestIndexForWatch

Gets the quest log index of a watched quest.
 questIndex = GetQuestIndexForWatch(watchIndex)
==Arguments==
:;watchIndex: - The index of a quest watch; an integer between 1 and GetNumQuestWatches().
==Returns==
:;questIndex: - The quest log's index of the watched quest.
==Caveats==
This function can return nil for valid watchIndex values if the watched quest isn't yet in the client cache. This can happen when logging in after clearing the cache.