Wordpress, limit number of words in post titles on archive pages only

limit_post_title_words_in_archive.php

<?php
// Display '...' on post titles in arcive pages
// Limit is 10 (default) if not defined in option: 'post_title_max_words' 
// Range of values: 1..20.
// The non trivial issue is to affect only relevant post titles
// and ignore menu post titles and archive page post title

function s2g_short_post_title( $title, $id = null ) {
    static $arc_data = null;
    if (is_null( $id )) return $title; // ignore
    
    if (is_archive() || is_home()){ // initialize "context", we are in archive page
        $post = get_post( $id );
        // no menu title, etc...
        if ( $post instanceof WP_Post && ( $post->post_type == 'post' || $post->post_type == 'page' ) ) {
            $arc_data = array('ID' => $id);
        }
        return $title; // no change in archive title
    }
    if (is_single() && is_null($arc_data)) // handle posts in sidebar widgets
        return $title;
    
    static $word_limit= null;
    if (is_null($word_limit)){
        $v = intval(get_option('post_title_max_words'));
        if (isset($v) && $v > 0 && $v < 20)
            $word_limit = $v;
        else $word_limit = 10;
    }
    $short_title = wp_trim_words( $title, $word_limit );
    return $short_title;
}
add_filter( 'the_title', 's2g_short_post_title', 10, 2 );