From db40cef900dee49fae1b47131181a701352fdf4e Mon Sep 17 00:00:00 2001
From: David Gasperoni <mcdado@gmail.com>
Date: Tue, 1 Dec 2015 21:58:09 +0100
Subject: [PATCH] MO: Correct negation of voucher discounts

Besides being more elegant and correct, this way enables developers
to create custom behaviors with Cart Rules, where instead of offering
discounts, they could increase the price. However, this change will not
effect anybody else.

See for example these screenshots:
http://cl.ly/image/0e0g2D1u0Y45 (before)
http://cl.ly/image/3b020a303N2v (after)

You can see how now the normal case is still a normal minus, while with
our custom built override we have a positive value, that is they way
it's meant to be.
---
 mailalerts.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mailalerts.php b/mailalerts.php
index 3b31064..7948b01 100644
--- a/mailalerts.php
+++ b/mailalerts.php
@@ -325,7 +325,7 @@ public function hookActionValidateOrder($params)
 			$items_table .=
 				'<tr style="background-color:#EBECEE;">
 						<td colspan="4" style="padding:0.6em 0.4em; text-align:right;">'.$this->l('Voucher code:').' '.$discount['name'].'</td>
-					<td style="padding:0.6em 0.4em; text-align:right;">-'.Tools::displayPrice($discount['value'], $currency, false).'</td>
+					<td style="padding:0.6em 0.4em; text-align:right;">'.Tools::displayPrice(0 - $discount['value'], $currency, false).'</td>
 			</tr>';
 		}
 		if ($delivery->id_state)