MC-37069: Configurable Products with large quantities of children cannot be opened

Author: duhon

app/code/Magento/ConfigurableProduct/view/adminhtml/web/js/components/dynamic-rows-configurable.js

@@ -242,6 +242,10 @@ define([
             this.generateAssociatedProducts();
         },
 
+        setInitialProperty: function () {
+            return this;
+        },
+
         /**
          * Parsed data
          *

app/code/Magento/Ui/view/base/web/js/dynamic-rows/dynamic-rows.js

@@ -1126,8 +1126,9 @@ define([
          * Update whether value differs from default value
          */
         setDifferedFromDefault: function () {
+            var recordData;
             if (this.default) {
-                var recordData = utils.copy(this.recordData());
+                recordData = utils.copy(this.recordData());
 
                 Array.isArray(recordData) && recordData.forEach(function (item) {
                     delete item['record_id'];

lib/web/mage/utils/objects.js

@@ -247,7 +247,16 @@ define([
          * @returns {Object|Array} Cloned object.
          */
         copy: function (data) {
-            return _.clone(data)
+            var result = data,
+                isArray = Array.isArray(data),
+                placeholder;
+
+            if (this.isObject(data) || isArray) {
+                placeholder = isArray ? [] : {};
+                result = this.extend(placeholder, data);
+            }
+
+            return result;
         },
 
         /**