Be smarter about dual-wield reactions.

Author: SupSuper

src/Savegame/BattleUnit.cpp

@@ -1780,13 +1780,18 @@ BattleItem *BattleUnit::getMainHandWeapon(bool quickest) const
 	// otherwise pick the one with the least snapshot TUs
 	int tuRightHand = weaponRightHand->getRules()->getTUSnap();
 	int tuLeftHand = weaponLeftHand->getRules()->getTUSnap();
-	if (tuLeftHand >= tuRightHand)
-	{
-		return quickest?weaponRightHand:weaponLeftHand;
-	}
+	// if only one weapon has snapshot, pick that one
+	if (tuLeftHand <= 0 && tuRightHand > 0)
+		return weaponRightHand;
+	else if (tuRightHand <= 0 && tuLeftHand > 0)
+		return weaponLeftHand;
+	// else pick the better one
 	else
 	{
-		return quickest?weaponLeftHand:weaponRightHand;
+		if (tuLeftHand >= tuRightHand)
+			return quickest ? weaponRightHand : weaponLeftHand;
+		else
+			return quickest ? weaponLeftHand : weaponRightHand;
 	}
 }