Fix magento#26427 - Expand all sections that contains invalid elements

Author: Bartlomiejsz

app/code/Magento/Config/view/adminhtml/templates/system/config/edit.phtml

@@ -256,15 +256,21 @@ require([
     });
 
     window.configForm.on('invalid-form.validate', function (event, validation) {
-        var firstActive = jQuery(validation.errorList[0].element || []);
-
-        if (firstActive.length) {
-            jQuery(firstActive.parents('.section-config')).each(function () {
-                if (!jQuery(this).hasClass('active')) {
-                    Fieldset.toggleCollapse(jQuery(this).children('.config.admin__collapsible-block').attr('id'));
-                }
-            })
+        if (validation.errorList.length === 0) {
+            return;
         }
+
+        jQuery.each(validation.errorList, function () {
+            var element = jQuery(this.element || []);
+
+            if (element.length) {
+                jQuery(element.parents('.section-config')).each(function () {
+                    if (!jQuery(this).hasClass('active')) {
+                        Fieldset.toggleCollapse(jQuery(this).children('.config.admin__collapsible-block').attr('id'));
+                    }
+                });
+            }
+        });
     })
 
     $$('.shared').each(function(element){