prevent-discount-exessive-saves.patch

diff --git a/commerce_discount.module b/commerce_discount.module
index c5e82bf..3b41161 100644
--- a/commerce_discount.module
+++ b/commerce_discount.module
@@ -6,12 +6,44 @@
  * their bundles, and all surrounding functionality (API, UI).
  */
 
+function commerce_discount_line_items_hash($wrapper) {
+  $line_items = $wrapper->commerce_line_items->value();
+  return md5(json_encode($line_items));
+
+  // Get the line item types to apply the discount to.
+  $line_item_types = variable_get('commerce_discount_line_item_types', array('product' => 'product'));
+  $line_item_types = array_filter($line_item_types);
+  // Loop through each line item, get it's value in an array and hash the array.
+  $line_items = array();
+  foreach ($wrapper->commerce_line_items as $delta => $wrapper_line_item) {
+    $line_item_type = $wrapper_line_item->getBundle();
+    if (isset($line_item_types[$line_item_type])) {
+      $line_items[] = $wrapper_line_item->value();
+    }
+  }
+
+  return md5(json_encode($line_items));
+}
+
 /**
  * Implements hook_commerce_cart_order_refresh().
  *
  * Remove any existing commerce discount line item.
  */
 function commerce_discount_commerce_cart_order_refresh($wrapper) {
+  $order = $wrapper->value();
+  if (!empty($order->data['commerce_discount_line_items_hash'])) {
+    $original_line_items_hash = $order->data['commerce_discount_line_items_hash'];
+    $original_line_items = $order->data['commerce_discount_original_line_items'];
+    $line_items = json_encode($wrapper->commerce_line_items->value(), JSON_PRETTY_PRINT);
+
+    // Check if line items have changed before doing any modifications.
+    $updated_line_items_hash = commerce_discount_line_items_hash($wrapper);
+    if ($updated_line_items_hash === $original_line_items_hash) {
+      return;
+    }
+  }
+
   $line_items_to_delete = array();
   $cloned_line_items = array();
   // Remove all discount references from the order.
@@ -75,7 +107,11 @@ function commerce_discount_commerce_cart_order_refresh($wrapper) {
   commerce_line_item_delete_multiple($line_items_to_delete);
 
   // Re-add all applicable discount price components and/or line items.
-  rules_invoke_event('commerce_discount_order', $wrapper->value());
+  rules_invoke_event('commerce_discount_order', $order);
+
+  // Re-hash the line items.
+  $order->data['commerce_discount_original_line_items'] = json_encode($wrapper->commerce_line_items->value(), JSON_PRETTY_PRINT);
+  $order->data['commerce_discount_line_items_hash'] = commerce_discount_line_items_hash($wrapper);
 }
 
 /**