rebase from live enviornment

wp/plugins/contact-form-7/includes/config-validator/messages.php

@@ -0,0 +1,55 @@
+<?php
+
+trait WPCF7_ConfigValidator_Messages {
+
+	/**
+	 * Runs error detection for the messages section.
+	 */
+	public function validate_messages() {
+		$messages = (array) $this->contact_form->prop( 'messages' );
+
+		if ( ! $messages ) {
+			return;
+		}
+
+		if (
+			isset( $messages['captcha_not_match'] ) and
+			! wpcf7_use_really_simple_captcha()
+		) {
+			unset( $messages['captcha_not_match'] );
+		}
+
+		foreach ( $messages as $key => $message ) {
+			$section = sprintf( 'messages.%s', $key );
+
+			if ( $this->supports( 'html_in_message' ) ) {
+				if ( $this->detect_html_in_message( $section, $message ) ) {
+					$this->add_error( $section, 'html_in_message',
+						array(
+							'message' => __( "HTML tags are used in a message.", 'contact-form-7' ),
+						)
+					);
+				} else {
+					$this->remove_error( $section, 'html_in_message' );
+				}
+			}
+		}
+	}
+
+
+	/**
+	 * Detects errors of HTML uses in a message.
+	 *
+	 * @link https://contactform7.com/configuration-errors/html-in-message/
+	 */
+	public function detect_html_in_message( $section, $content ) {
+		$stripped = wp_strip_all_tags( $content );
+
+		if ( $stripped !== $content ) {
+			return true;
+		}
+
+		return false;
+	}
+
+}