Fix for webkit (Chrome, Safari) adding style="line-height: 1.55;" all over the place in the WordPress content editor.

WordPress Webkit Line Height Fixer

<?php
/*
Plugin Name: Webkit Line Height Fixer
Plugin URI:  https://gist.github.com/lumpysimon/8782859
Description: Remove the annoying inline line-height styles added by Webkit
Version:     1.0
Author:      Simon Blackbourn @ Lumpy Lemon
Author URI:  http://lumpylemon.co.uk

See also: https://core.trac.wordpress.org/ticket/26975

Released under the GPL license:
http://www.opensource.org/licenses/gpl-license.php

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

*/



defined( 'ABSPATH' ) or die();



webkit_lhf::get_instance();



class webkit_lhf {



	// used to prevent infinite looping on the save_post hook
	var $no_recursion = false;



	private static $instance = null;



	public static function get_instance() {

		if ( null == self::$instance ) {
			self::$instance = new self;
		}

		return self::$instance;

	}



	private function __construct() {

		add_action( 'save_post', array( $this, 'strip_n_save' ), 10, 2 );

	}



	function strip_n_save( $post_id, $post ) {

		if ( $this->no_recursion )
			return;

		$content = str_replace( ' style="line-height: 1.5;"', '', $post->post_content );
		$content = str_replace( ' style="line-height: 1.5em;"', '', $content );
		$content = str_replace( ' style="line-height: 1.55;"', '', $content );

		$post_data = array(
			'ID'           => $post_id,
			'post_content' => $content
			);

		$this->no_recursion = true;
		wp_update_post( $post_data );
		$this->no_recursion = false;

	}



}