Add default values in eval key

src/Contao/Widgets/MultiColumnWizard.php

@@ -170,6 +170,11 @@ class MultiColumnWizard extends Widget
 
     private ?TranslatorInterface $translator = null;
 
+    /**
+     * @var array|mixed|string|string[]|null
+     */
+    private mixed $defaultValue;
+
     /**
      * Initialize the object
      *
@@ -257,6 +262,10 @@ public function __set($strKey, $varValue)
                 }
                 break;
 
+            case 'default':
+                $this->defaultValue = StringUtil::deserialize($varValue, true);
+                break;
+
             case 'mandatory':
                 $this->arrConfiguration['mandatory'] = $varValue ? true : false;
                 break;
@@ -804,6 +813,10 @@ public function generate($overwriteRowCurrentRow = null, $onlyRows = false)
         }
 
         $intNumberOfRows = max(count($this->varValue), 1);
+        $useDefaultValue = (0 == count($this->varValue));
+        if($useDefaultValue && !empty($this->defaultValue)) {
+            $intNumberOfRows = count($this->defaultValue);
+        }
 
         // always show the minimum number of rows if set
         if ($this->minCount && ($intNumberOfRows < $this->minCount)) {
@@ -839,6 +852,11 @@ public function generate($overwriteRowCurrentRow = null, $onlyRows = false)
                     $arrField = array_merge($arrField, $this->arrRowSpecificData[$i][$strKey]);
                 }
 
+                // Should we do this above the foreach and run a foreach twice ... nope.
+                if ($useDefaultValue && !empty($this->defaultValue[$i][$strKey] ?? null)) {
+                    $this->varValue[$i][$strKey] = $this->defaultValue[$i][$strKey];
+                }
+
                 $objWidget = $this->initializeWidget(
                     $arrField,
                     $i,