Fixes #7671. On FormElements, 'fillStoreVar' is now detected and fired at first

extension/Source/core/Evaluate.php

@@ -87,6 +87,16 @@ class Evaluate {
     public function parseArray($tokenArray, array $skip = array(), &$debugStack = array()) {
         $arr = array();
 
+        // In case there is an Element 'fillStoreVar', process that first.
+        if(!empty($tokenArray[FE_FILL_STORE_VAR]) && is_string($tokenArray[FE_FILL_STORE_VAR])){
+
+            $arr=$this->parse($tokenArray[FE_FILL_STORE_VAR], ROW_REGULAR, 0, $debugStack);
+            if(!empty($arr)){
+                $this->store::setStore($arr[0],STORE_VAR);
+            }
+            unset($tokenArray[FE_FILL_STORE_VAR]);
+        }
+
         foreach ($tokenArray as $key => $value) {
 
             if (array_search($key, $skip) !== false) {