Refresh variant cache when changing stock movements

app/models/spree/stock_movement_decorator.rb

@@ -0,0 +1,10 @@
+Spree::StockMovement.class_eval do
+  after_save :refresh_products_cache
+
+  private
+
+  def refresh_products_cache
+    return if stock_item.variant.blank?
+    OpenFoodNetwork::ProductsCache.variant_changed stock_item.variant
+  end
+end