switch to html2text() instead of strip_tags() when preparing FTS index

vendor/soundasleep/html2text/html2text.php

@@ -0,0 +1,16 @@
+<?php
+/**
+ * This file is available if you still want to use functions rather than
+ * autoloading classes.
+ */
+
+require_once(__DIR__ . "/src/Html2Text.php");
+require_once(__DIR__ . "/src/Html2TextException.php");
+
+function convert_html_to_text($html, $ignore_error = false) {
+	return Soundasleep\Html2Text::convert($html, $ignore_error);
+}
+
+function fix_newlines($text) {
+	return Soundasleep\Html2Text::fixNewlines($text);
+}