Cacher is the code snippet organizer for pro developers

<?php
/**
 * Plugin Name: Remove br in pre
 * Plugin URI:  http://wordpress.stackexchange.com/questions/39843/no-filter-of-code-on-switch-from-html-to-visual-editor-how
 * Text Domain: 
 * Domain Path: /languages
 * Description: 
 * Version:	beta
 * Author:      Frank Bültge
 * Author URI:  http://bueltge.de
 * License:     GPLv3
 */

	remove_filter( 'tiny_mce_before_init', '_mce_set_direction' );
	
	add_filter( 'tiny_mce_before_init', 'fb_tinymce', 9 );
	
	function fb_tinymce( $init ) {
		
		$init['fix_list_elements'] = FALSE;
		$init['wpautop'] = FALSE;
		$init['remove_linebreaks'] = FALSE;
		$init['apply_source_formatting'] = TRUE;
		$init['extended_valid_elements'] .= ',pre[*],code[*]';
		
		return $init;
	}