When used on order items, work with the given adjustments

I created a first merge request, this still needs to be properly tested on our side.

The logic is a bit convoluted now due all the if/else conditions, it might make sense to introduce two methods to abstract this, wanted to keep the changes minimal for now.

At first I wasn't sure if the adjustment types setting works with order items then, but I think it actually works very well, all the API's we need allow to provide adjustment types, just have to be careful about when it ends up being empty.

Thanks for the patch.

It works unless promotions are set to "Include the discount in the displayed unit price."
(This option was introduced in: https://www.drupal.org/project/commerce/issues/3025383 → )

When "Include the discount in the displayed unit price" is enabled, order items only show the final price, as "original_price" and "final_price" are identical.

I wasn’t able to fully understand the API used to fix this issue, but if someone can give me any tips, I’d be happy to create a patch.

Additionally, the code below seems to have the exact same statement within both the if and else blocks:

if ($items->getName() === 'total_price') {
          $result = new PriceCalculatorResult($purchasable_entity->getAdjustedTotalPrice($adjustment_types), $purchasable_entity->getTotalPrice(), $adjustments);
        }
        else {
          $result = new PriceCalculatorResult($purchasable_entity->getAdjustedTotalPrice($adjustment_types), $purchasable_entity->getTotalPrice(), $adjustments);
        }

thanks

this works well for my needs. (showing price difference in the views order cart table)

I made one small change that @fostip pointed out.