1. Users of php 7.3 should replace \include\thirdparty\JShrink --> minifier.php ( momentary version 1.0 )
with Version 1.33 which has further bugfixes , available at https://github.com/tedious/JShrink/releases
2. /include/Page/Edit.php ---- line 1111
$is_wrapper = count($types) > 1 || is_array($types);
gives a debug error ::
Warning: count(): Parameter must be an array or an object that implements Countable in /include/Page/Edit.php on line 1111.
should be with inserted (array) :
$is_wrapper = count((array)$types) > 1 || is_array($types);
3. For the layout-editor Codemirror are updates available, which can be downloaded at https://cdnjs.com/libraries/codemirror/5.48.4
and copied into \include\thirdparty\codemirror\mode\css and \include\thirdparty\codemirror\lib (3 files).
4. For missing in the Layout-editor Linenumbers a forumtip for theme_content_outer.js
I have published a new Typesetter 5.1.1 CE - version at Github, which includes Ckeditor 4.62, Less 2.5.3, and Scssphp1.04 for php7.4, and a blue skin and mod-deflate.