[2.x] Update $form_state['order'] on ajax submit

Version: 2.x (not yet available in list of choices)

I implemented the hook_commerce_coupon_add_coupon_ajax_alter() (to update the order total which is in a nonstandard place on my checkout page) -- and discovered that the $order object passed is outdated. The reason is that in commerce_coupon_pane_checkout_form()$form_state['order'] and $order are not the same object anymore, after you re-load $order... so $form_state['order'] is not refreshed with the newest discounts.

Fix attached. And I have a habit of re-commenting code that I don't understand at first/second/third sight, so there :)

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A slightly related observation in the same (don't understand at first sight) category:

I thought "It's a real shame that the drupal_alter('commerce_coupon_add_coupon_ajax', $commands, $form_state['order']); does not pass $form as an argument! Because all I want to do on my alter is this:$commands[] = ajax_command_replace('#my-selector', drupal_render($form['my-custom-pane-thingy']['order_total']));
...and now I don't have $form, I need to reconstruct this form element myself!

After testing, it turned out that I would have to do that anyway, because my $form['my-custom-pane-thingy'] was outdated. (It is built before the commerce_coupon pane, i.e. with the old order.)

So I was wondering if your not passing $form as an argument to the drupal_alter was intentional, because $form cannot be trusted 100%? :)