fix vendor gather overbuying

TradeSkillMaster/TradeSkillMaster.toc

@@ -2,7 +2,7 @@
 ## Title: |cff00fe00TradeSkillMaster: Revived|r
 ## Notes: Core addon for the TradeSkillMaster suite, revived for Wrath of the Lich King. Does nothing without modules installed.
 ## Author: Sapu94, Bart39, Gnomezilla [Warmane-Icecrown(A)], BlueAo [Warmane], andrew6180, Yoshiyuka, DimaSheiko, and other contributors...
-## Version: 2.3.40
+## Version: 2.3.41
 ## SavedVariables: TradeSkillMasterAppDB, AscensionTSMDB
 ## OptionalDeps: AccurateTime, Ace3, LibDataBroker-1.1, LibDBIcon-1.0, LibExtraTip, TipHelper, LibParse, LibCompress, LibGraph-2.0, SharedMedia, TheUndermineJournal, TheUndermineJournalGE
 ## X-Embeds: AccurateTime, Ace3, LibDataBroker-1.1, LibDBIcon-1.0, LibExtraTip, TipHelper, LibParse, LibCompress, LibGraph-2.0

TradeSkillMaster_AuctionDB/TradeSkillMaster_AuctionDB.toc

@@ -2,10 +2,10 @@
 ## Title: |cff00ff00TradeSkillMaster_AuctionDB|r
 ## Notes: Stores auction house data and calculates market prices.
 ## Author: Sapu94, Bart39
-## Version: 2.3.40
+## Version: 2.3.41
 ## SavedVariables: AscensionTSM_AuctionDB
 ## Dependency: TradeSkillMaster
-## X-Curse-Packaged-Version: 2.3.40
+## X-Curse-Packaged-Version: 2.3.41
 ## X-Curse-Project-Name: TradeSkillMaster_AuctionDB
 ## X-Curse-Project-ID: tradeskillmaster_auctiondb
 ## X-Curse-Repository-ID: wow/tradeskillmaster_auctiondb/mainline

TradeSkillMaster_Crafting/Modules/Gather.lua

@@ -18,11 +18,17 @@ function Gather:BuyFromMerchant(neededMats)
 	for i = 1, GetMerchantNumItems() do
 		local itemString = TSMAPI:GetItemString(GetMerchantItemLink(i))
 		if neededMats[itemString] then
+			local _, _, _, quantity = GetMerchantItemInfo(i)
 			local maxStack = GetMerchantItemMaxStack(i)
+			quantity = max(quantity or 1, 1)
 			local toBuy = neededMats[itemString]
 			while toBuy > 0 do
-				BuyMerchantItem(i, math.min(toBuy, maxStack))
+				local buyCount = math.ceil(toBuy / quantity)
-				toBuy = toBuy - maxStack
+				if maxStack and maxStack > 0 then
+					buyCount = math.min(buyCount, maxStack)
+				end
+				BuyMerchantItem(i, buyCount)
+				toBuy = toBuy - (buyCount * quantity)
 				TSM.db.realm.gathering.gatheredMats = true
 			end
 		end