[BUGFIX] All option values were deleted if one was deleted earlier

The problem occurs if you delete one custom option value was deleted. This occurred because the same value object is used for saving all values, and if one value is deleted the _isDeleted flag is set tot true on that object. So all values after that value will also be deleted.

Author: bartlubbersen

app/code/Magento/Catalog/Model/Product/Option/Value.php

@@ -189,7 +189,8 @@ public function getProduct()
      */
     public function saveValues()
     {
-        foreach ($this->getValues() as $value) {
+        foreach ($this->getValues() as $value) 
+            $this->isDeleted(false);
             $this->setData(
                 $value
             )->setData(