first commit

plugins/convertforms/emails/form/fields.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<form>
+    <fieldset>
+        <field name="recipient" type="text"
+            label="COM_CONVERTFORMS_EMAILS_RECIPIENT"
+            description="COM_CONVERTFORMS_EMAILS_RECIPIENT_DESC"
+            hint="COM_CONVERTFORMS_EMAILS_RECIPIENT"
+            class="show-smart-tags"
+            default="{site.email}"
+            required="true"
+        />
+        <field name="subject" type="text"
+            label="COM_CONVERTFORMS_EMAILS_SUBJECT"
+            hint="COM_CONVERTFORMS_EMAILS_SUBJECT"
+            class="show-smart-tags"
+            default="New Submission #{submission.id}: Contact Form"
+            required="true"
+        />
+        <field name="from_name" type="text"
+            label="COM_CONVERTFORMS_EMAILS_FROM"
+            hint="COM_CONVERTFORMS_EMAILS_FROM"
+            class="show-smart-tags"
+            default="{site.name}"
+            required="true"
+        />  
+        <field name="from_email" type="text"
+            label="COM_CONVERTFORMS_EMAILS_FROM_EMAIL"
+            hint="COM_CONVERTFORMS_EMAILS_FROM_EMAIL"
+            class="show-smart-tags"
+            default="{site.email}"
+            required="true"
+        />
+        <field name="reply_to" type="text"
+            label="COM_CONVERTFORMS_EMAILS_REPLY_TO"
+            hint="COM_CONVERTFORMS_EMAILS_REPLY_TO"
+            class="show-smart-tags"
+        />
+        <field name="reply_to_name" type="text"
+            label="COM_CONVERTFORMS_EMAILS_REPLY_TO_NAME"
+            hint="COM_CONVERTFORMS_EMAILS_REPLY_TO_NAME"
+            class="show-smart-tags"
+        />
+        <field name="body" type="textarea"
+            label="COM_CONVERTFORMS_EMAILS_BODY"
+            class="editorx show-smart-tags"
+            filter="raw"
+            required="true"
+            default="{all_fields}"
+        />
+        <field name="attachments" type="text"
+            label="COM_CONVERTFORMS_EMAILS_ATTACHMENT"
+            description="COM_CONVERTFORMS_EMAILS_ATTACHMENT_DESC"
+            hint="images/myattachment.pdf"
+            class="show-smart-tags"
+        />
+    </fieldset>
+</form>

plugins/convertforms/emails/form/fields/cfsubform.php

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+<?php
+
+/**
+ * @package         Convert Forms
+ * @version         3.2.12 Free
+ * 
+ * @author          Tassos Marinos <info@tassos.gr>
+ * @link            http://www.tassos.gr
+ * @copyright       Copyright © 2020 Tassos Marinos All Rights Reserved
+ * @license         GNU GPLv3 <http://www.gnu.org/licenses/gpl.html> or later
+*/
+
+defined('_JEXEC') or die('Restricted access');
+
+JFormHelper::loadFieldClass('subform');
+
+class JFormFieldCFSubform extends JFormFieldSubform
+{
+	/**
+	 * Method to get the field input markup.
+	 *
+	 * @return  string  The field input markup.
+	 *
+	 * @since   3.6
+	 */
+	protected function getInput()
+	{
+		// The following script toggles the required attribute for all Email Notification options.
+		JFactory::getDocument()->addScriptDeclaration('
+			jQuery(function($) {
+				$("input[name=\'jform[sendnotifications]\']").on("change", function() {
+					var enabled = $(this).is(":checked");
+					var exclude_fields = $("input[id*=reply_to], input[id$=attachments]");
+					var fields = $("#behavior-emails .subform-repeatable-group").find("input, textarea").not(exclude_fields);
+
+					if (enabled) {
+						fields.attr("required", "required").addClass("required");
+					} else {
+						fields.removeAttr("required").removeClass("required");
+					}
+				});
+			});
+		');
+
+		return parent::getInput();
+	}
+}

plugins/convertforms/emails/form/form.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<form>
+    <fieldset name="emails" label="COM_CONVERTFORMS_EMAILS" tab="behavior" addfieldpath="plugins/convertforms/emails/form/fields">
+        
+        <field name="emails-free-note" type="note"
+            class="alert alert-error"
+            description="COM_CONVERTFORMS_EMAILS_FREE_NOTE"
+        />
+        
+        <field name="sendnotifications" type="nrtoggle" 
+            label="COM_CONVERTFORMS_EMAILS_DESC"
+        />
+        
+        <field name="emails" type="cfsubform"
+            formsource="/plugins/convertforms/emails/form/fields.xml"
+            hiddenLabel="true"
+            multiple="true"
+            buttons="false"
+            max="1"
+            showon="sendnotifications:1"
+            default='{ "emails0": {} }'
+        />
+        
+        
+    </fieldset>
+</form>