From e9b12639d282c13f0e413e9a152f53586f05ba7c Mon Sep 17 00:00:00 2001
From: Fanny DECLERCK <fadec@smile.fr>
Date: Wed, 5 Jul 2017 11:51:28 +0200
Subject: [PATCH] Fix product position virtual categories

---
 .../community/Smile/VirtualCategories/Model/Observer.php  | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/app/code/community/Smile/VirtualCategories/Model/Observer.php b/src/app/code/community/Smile/VirtualCategories/Model/Observer.php
index 41ad571f..2d50dbe6 100644
--- a/src/app/code/community/Smile/VirtualCategories/Model/Observer.php
+++ b/src/app/code/community/Smile/VirtualCategories/Model/Observer.php
@@ -127,10 +127,16 @@ public function saveProductsPositions(Varien_Event_Observer $observer)
         $filteredPositions = array_filter($positions, 'is_numeric');
         $resourceModel     = Mage::getResourceModel("smile_virtualcategories/catalog_virtualCategory_product_position");
         $previousProducts  = $resourceModel->getProductIdsByCategory($category);
+        $previousPosition  = $resourceModel->getByProductIds($previousProducts);
 
+        foreach ($previousPosition as $position) {
+            if (!isset($filteredPositions[$position["product_id"]])) {
+                $filteredPositions[$position["product_id"]] = $position['position'];
+            }
+        }
         $resourceModel->saveProductsPositions($filteredPositions, $category);
 
-        $productIdsToReindex = array_unique(array_merge($previousProducts, array_keys($filteredPositions)));
+        $productIdsToReindex = array_keys($filteredPositions);
 
         if (empty($productIdsToReindex)) {
             return $this;