Returns whether the trade skill listing is filtered by a given item equipment slot
See also Tradeskill functions.
Signature:
enabled = GetTradeSkillInvSlotFilter(index)
Arguments:
index- Index of an item equipment slot (in the list returned byGetTradeSkillInvSlots()), or0for the "All" filter (number)
Returns:
enabled- 1 if the filter is enabled; otherwise nil (1nil)