use IsContainerItemOpenable and bump minimum ClassicAPI version to 1.2.1

modules/bags.lua

@@ -285,15 +285,11 @@ pfUI:RegisterModule("bags", function ()
       local bagsize = GetContainerNumSlots(bag)
       if bag == -2 and pfUI.bag.showKeyring == true then bagsize = GetKeyRingSize() end
       for slot=1, bagsize do
-        if GetContainerItemInfo(bag, slot) then
-          scanner:SetBagItem(bag, slot)
-
-          if scanner:Find(_G.ITEM_OPENABLE, true) then
-            openable.bag = bag
-            openable.slot = slot
-            openable.icon = GetContainerItemInfo(bag, slot)
-            return openable.bag, openable.slot
-          end
+        if C_Container.IsContainerItemOpenable(bag, slot) then
+          openable.bag = bag
+          openable.slot = slot
+          openable.icon = GetContainerItemInfo(bag, slot)
+          return openable.bag, openable.slot
         end
       end
     end

pfUI.lua

@@ -25,11 +25,8 @@ pfUI.bootup = true
 
 -- ClassicAPI dependency check.
 -- pfUI relies pervasively on the modern C_* / SuperWoW / nameplate / focus
--- API surface that ClassicAPI polyfills, so presence is required (not
--- optional). Without it, users would otherwise see a flood of "attempt to
--- index a nil value" errors as each module tries to call C_Container /
--- C_Item / C_UnitAuras / C_NamePlate / FocusUnit / etc.
-local PFUI_CLASSIC_API_MIN = 10200  -- v1.2.0 (X*10000 + Y*100 + Z)
+-- API surface that ClassicAPI polyfills, so presence is required.
+local PFUI_CLASSIC_API_MIN = 10201  -- v1.2.0 (X*10000 + Y*100 + Z)
 if not CLASSIC_API_VERSION or CLASSIC_API_VERSION < PFUI_CLASSIC_API_MIN then
   pfUI.disabled = true