Ignore lights without CanCarry flags when NPC selects torch (bug #4457)

CHANGELOG.md

@@ -30,6 +30,7 @@
     Bug #4451: Script fails to compile when using "Begin, [ScriptName]" syntax
     Bug #4453: Quick keys behaviour is invalid for equipment
     Bug #4454: AI opens doors too slow
+    Bug #4457: Item without CanCarry flag prevents shield autoequipping in dark areas
     Feature #4256: Implement ToggleBorders (TB) console command
     Feature #3276: Editor: Search- Show number of (remaining) search results and indicate a search without any results
     Feature #4222: 360° screenshots

apps/openmw/mwmechanics/actors.cpp

@@ -984,7 +984,8 @@ namespace MWMechanics
             MWWorld::ContainerStoreIterator torch = inventoryStore.end();
             for (MWWorld::ContainerStoreIterator it = inventoryStore.begin(); it != inventoryStore.end(); ++it)
             {
-                if (it->getTypeName() == typeid(ESM::Light).name())
+                if (it->getTypeName() == typeid(ESM::Light).name() &&
+                    it->getClass().canBeEquipped(*it, ptr).first)
                 {
                     torch = it;
                     break;
@@ -1005,8 +1006,7 @@ namespace MWMechanics
                     heldIter = inventoryStore.getSlot(MWWorld::InventoryStore::Slot_CarriedLeft);
 
                     // If we have a torch and can equip it, then equip it now.
-                    if (heldIter == inventoryStore.end()
+                    if (heldIter == inventoryStore.end())
-                            && torch->getClass().canBeEquipped(*torch, ptr).first == 1)
                     {
                         inventoryStore.equip(MWWorld::InventoryStore::Slot_CarriedLeft, torch, ptr);
                     }