This filter can be used to echo an HTML of the new buttons on the comment form editor.
Changelog
since 7.0.0 version
Parameters
$html (type: string) - the HTML of the new buttons
$uniqueId (type: string) - the unique ID of the form
$uniqueId (type: string) - the unique ID of the form
Usage
add_filter("wpdiscuz_editor_buttons_html", function ($html, $uniqueId) {
echo "Custom Button HTML";
}, 1, 2);