added url patch as a separate plugin

plugins/formbuilder_url_patch/formbuilder_url_patch.php

@@ -0,0 +1,28 @@
+<?php
+/*
+Plugin Name: formbuilder url patch
+Plugin URI:
+Description: 
+Author: hugogogo
+Version: 1.1.0
+Author URI:
+*/
+
+/**
+ * in `wp-content/plugins/divi-form-builder/includes/DiviFormBuilder.php`
+ * also :
+ * - Undefined variable: min_length in /var/www/html/wp-content/plugins/divi-form-builder/includes/modules/FormField/FormField.php on line 5933
+ * - Undefined variable: use_icon in /var/www/html/wp-content/plugins/divi-form-builder/includes/modules/FormField/FormField.php on line 5984
+ */
+function add_my_jquery_patch()
+{
+	$handle = 'jquery_validator_url_patch';
+	$url = plugin_dir_url(__FILE__) . 'jquery_validator_url_patch.js';
+	$dependencies = array('de_fb_validate');
+	$version = '';
+	$defer = true;
+	wp_enqueue_script( $handle, $url, $dependencies, $version, $defer);
+}
+add_action('wp_enqueue_scripts', 'add_my_jquery_patch');
+
+?>

plugins/formbuilder_url_patch/jquery_validator_url_patch.js

@@ -0,0 +1,8 @@
+// https://stackoverflow.com/questions/12741517/how-to-make-url-validation-without-http-or-add-it-after-validation-passed/44848476#44848476
+
+let old_url = jQuery.validator.methods.url;
+jQuery.validator.addMethod( 'url', function(value, element) {
+		let url = old_url.bind(this);
+		return url(value, element) || url('http://' + value, element);
+	}, 'Please enter a valid URL'
+);