ENGCOM-3161: [Forwardport] #4942 and bundle checkbox bug #18520

 - Merge Pull Request #18520 from gelanivishal/magento2:2.3-develop-PR-port-15905
 - Merged commits:
   1. e210b70
   2. 53f5942
   3. 8050d50
   4. 0bd75c8

Author: magento-engcom-team

app/code/Magento/Bundle/Block/Catalog/Product/View/Type/Bundle.php

@@ -7,6 +7,7 @@
 
 use Magento\Bundle\Model\Option;
 use Magento\Catalog\Model\Product;
+use Magento\Framework\DataObject;
 
 /**
  * Catalog bundle product info block
@@ -170,7 +171,7 @@ public function getJsonConfig()
 
         $defaultValues = [];
         $preConfiguredFlag = $currentProduct->hasPreconfiguredValues();
-        /** @var \Magento\Framework\DataObject|null $preConfiguredValues */
+        /** @var DataObject|null $preConfiguredValues */
         $preConfiguredValues = $preConfiguredFlag ? $currentProduct->getPreconfiguredValues() : null;
 
         $position = 0;
@@ -193,12 +194,13 @@ public function getJsonConfig()
                         $options[$optionId]['selections'][$configValue]['qty'] = $configQty;
                     }
                 }
+                $options = $this->processOptions($optionId, $options, $preConfiguredValues);
             }
             $position++;
         }
         $config = $this->getConfigData($currentProduct, $options);
 
-        $configObj = new \Magento\Framework\DataObject(
+        $configObj = new DataObject(
             [
                 'config' => $config,
             ]
@@ -403,4 +405,30 @@ private function getConfigData(Product $product, array $options)
         ];
         return $config;
     }
+
+    /**
+     * Set preconfigured quantities and selections to options.
+     *
+     * @param string $optionId
+     * @param array $options
+     * @param DataObject $preConfiguredValues
+     * @return array
+     */
+    private function processOptions(string $optionId, array $options, DataObject $preConfiguredValues)
+    {
+        $preConfiguredQtys = $preConfiguredValues->getData("bundle_option_qty/${optionId}") ?? [];
+        $selections = $options[$optionId]['selections'];
+        array_walk($selections, function (&$selection, $selectionId) use ($preConfiguredQtys) {
+            if (is_array($preConfiguredQtys) && isset($preConfiguredQtys[$selectionId])) {
+                $selection['qty'] = $preConfiguredQtys[$selectionId];
+            } else {
+                if ((int)$preConfiguredQtys > 0) {
+                    $selection['qty'] = $preConfiguredQtys;
+                }
+            }
+        });
+        $options[$optionId]['selections'] = $selections;
+
+        return $options;
+    }
 }

app/code/Magento/Bundle/Block/Catalog/Product/View/Type/Bundle/Option.php

@@ -167,7 +167,9 @@ protected function _getSelectedOptions()
      */
     protected function assignSelection(\Magento\Bundle\Model\Option $option, $selectionId)
     {
-        if ($selectionId && $option->getSelectionById($selectionId)) {
+        if (is_array($selectionId)) {
+            $this->_selectedOptions = $selectionId;
+        } else if ($selectionId && $option->getSelectionById($selectionId)) {
             $this->_selectedOptions = $selectionId;
         } elseif (!$option->getRequired()) {
             $this->_selectedOptions = 'None';

app/code/Magento/Bundle/Test/Mftf/Test/StorefrontEditBundleProductTest.xml

@@ -94,9 +94,8 @@
         <click stepKey="clickEdit" selector="{{CheckoutCartProductSection.nthEditButton('1')}}"/>
         <waitForPageLoad stepKey="waitForStorefront2"/>
 
-        <!-- Choose both of the options on the storefront -->
-        <click stepKey="selectFirstBundleOption2" selector="{{StorefrontBundledSection.nthBundledOption('1','1')}}"/>
-        <click stepKey="selectSecondBundleOption2" selector="{{StorefrontBundledSection.nthBundledOption('1','2')}}"/>
+        <!-- Check second one option to choose both of the options on the storefront -->
+        <click selector="{{StorefrontBundledSection.bundleOption('1','2')}}" stepKey="selectSecondBundleOption2"/>
 
         <waitForPageLoad stepKey="waitForPriceUpdate3"/>
         <see stepKey="seeDoublePrice" selector="{{StorefrontBundledSection.configuredPrice}}" userInput="2,460.00"/>