ItemButtons: Added support for Pawn (third-party addon).

Fixes #503 & closes #504.

Author: Talyrius

AdiBags.toc

@@ -26,7 +26,7 @@
 ## SavedVariables: AdiBagsDB
 ## X-Date: @project-date-iso@
 ## X-License: GPL v3
-## OptionalDeps: LibStub, CallbackHandler-1.0, Ace3, LibSharedMedia-3.0, Scrap, BrainDead, !BugGrabber, SyLevel
+## OptionalDeps: LibStub, CallbackHandler-1.0, Ace3, LibSharedMedia-3.0, Scrap, BrainDead, !BugGrabber, SyLevel, Pawn
 #@alpha@
 ## OptionalDeps: AdiDebug, BugSack, Swatter
 #@end-alpha@

widgets/ItemButton.lua

@@ -34,11 +34,13 @@ local GetContainerNumFreeSlots = _G.GetContainerNumFreeSlots
 local GetItemInfo = _G.GetItemInfo
 local GetItemQualityColor = _G.GetItemQualityColor
 local hooksecurefunc = _G.hooksecurefunc
+local IsContainerItemAnUpgrade = _G.IsContainerItemAnUpgrade
 local IsInventoryItemLocked = _G.IsInventoryItemLocked
 local ITEM_QUALITY_COMMON = _G.Enum.ItemQuality.Standard
 local ITEM_QUALITY_POOR = _G.Enum.ItemQuality.Poor
 local next = _G.next
 local pairs = _G.pairs
+local PawnIsContainerItemAnUpgrade = _G.PawnIsContainerItemAnUpgrade
 local select = _G.select
 local SetItemButtonDesaturated = _G.SetItemButtonDesaturated
 local StackSplitFrame = _G.StackSplitFrame
@@ -347,6 +349,13 @@ function buttonProto:UpdateNew()
 	self.BattlepayItemTexture:SetShown(IsBattlePayItem(self.bag, self.slot))
 end
 
+function buttonProto:UpdateUpgradeIcon()
+	-- Use Pawn's (third-party addon) function if present; else fallback to Blizzard's.
+	local PawnIsContainerItemAnUpgrade = _G.PawnIsContainerItemAnUpgrade
+	local itemIsUpgrade = PawnIsContainerItemAnUpgrade and PawnIsContainerItemAnUpgrade(self.bag, self.slot) or IsContainerItemAnUpgrade(self.bag, self.slot)
+	self.UpgradeIcon:SetShown(itemIsUpgrade or false)
+end
+
 local function GetBorder(bag, slot, itemId, settings)
 	if not settings.qualityHighlight then
 		return