Index: wp-admin/edit.php
===================================================================
--- wp-admin/edit.php	(revision 23484)
+++ wp-admin/edit.php	(working copy)
@@ -145,6 +145,7 @@
 $wp_list_table->prepare_items();
 
 wp_enqueue_script('inline-edit-post');
+wp_enqueue_script('edit-post');
 
 $title = $post_type_object->labels->name;
 
Index: wp-admin/includes/class-wp-posts-list-table.php
===================================================================
--- wp-admin/includes/class-wp-posts-list-table.php	(revision 23484)
+++ wp-admin/includes/class-wp-posts-list-table.php	(working copy)
@@ -555,7 +555,7 @@
 
 				if ( $lock_holder && $can_edit_post && $post->post_status != 'trash' ) {
 					printf( '<span class="lock-holder">%s</span>',
-						esc_html( sprintf( __( '%s is currently editing' ), $lock_holder->display_name )  ) );
+						esc_html( sprintf( __( '%s is currently editing' ), $lock_holder->display_name ) ) );
 				}
 
 				if ( ! $this->hierarchical_display && 'excerpt' == $mode && current_user_can( 'read_post', $post->ID ) )
Index: wp-admin/includes/misc.php
===================================================================
--- wp-admin/includes/misc.php	(revision 23484)
+++ wp-admin/includes/misc.php	(working copy)
@@ -561,3 +561,22 @@
 	}
 }
 add_action('admin_head', '_ipad_meta');
+
+function wp_check_locked_posts( $response, $data ) {
+	$checked = array();
+
+	if ( array_key_exists('wp-check-locked', $data) ) {
+		foreach ( $data['wp-check-locked'] as $key ) {
+			if ( $user_id = wp_check_post_lock( substr($key, 5) ) ) {
+				if ( $user = get_userdata($user_id) )
+					$checked[$key] = sprintf( __( '%s is currently editing' ), $user->display_name );
+			}
+		}
+	}
+
+	if ( !empty($checked) )
+		$response['wp-check-locked'] = $checked;
+
+	return $response;
+}
+add_filter( 'heartbeat_received', 'wp_check_locked_posts', 10, 2 );
Index: wp-admin/js/edit-post.js
===================================================================
--- wp-admin/js/edit-post.js	(revision 0)
+++ wp-admin/js/edit-post.js	(working copy)
@@ -0,0 +1,25 @@
+(function($){
+	$( document ).on( 'heartbeat-tick.wp-check-locked', function( e, data ) {
+		var locked = data['wp-check-locked'] || {};
+		
+		$('#the-list tr').each( function(i, el) {
+			var key = el.id, row = $(el);
+			
+			if ( locked.hasOwnProperty( key ) ) {
+				if ( ! row.hasClass('wp-locked') )
+					row.addClass('wp-locked').find('.column-title strong').after( $('<span class="lock-holder" />').text(locked[key]) );
+					row.find('.check-column checkbox').prop('checked', false);
+			} else if ( row.hasClass('wp-locked') ) {
+				row.removeClass('wp-locked').find('.column-title span.lock-holder').remove();
+			}
+		});
+	}).on( 'heartbeat-send.wp-check-locked', function( e, data ) {
+		var check = [];
+		
+		$('#the-list tr').each( function(i, el) {
+			check.push( el.id );
+		});
+
+		data['wp-check-locked'] = check;
+	});
+}(jQuery));
Index: wp-admin/js/edit-post.js
===================================================================
--- wp-admin/js/edit-post.js	(revision 0)
+++ wp-admin/js/edit-post.js	(working copy)

Property changes on: wp-admin/js/edit-post.js
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Index: wp-includes/script-loader.php
===================================================================
--- wp-includes/script-loader.php	(revision 23484)
+++ wp-includes/script-loader.php	(working copy)
@@ -416,6 +416,8 @@
 		// @todo: Core no longer uses theme-preview.js. Remove?
 		$scripts->add( 'theme-preview', "/wp-admin/js/theme-preview$suffix.js", array( 'thickbox', 'jquery' ), false, 1 );
 
+		$scripts->add( 'edit-post', "/wp-admin/js/edit-post$suffix.js", array( 'heartbeat' ), false, 1 );
+
 		$scripts->add( 'inline-edit-post', "/wp-admin/js/inline-edit-post$suffix.js", array( 'jquery', 'suggest' ), false, 1 );
 		did_action( 'init' ) && $scripts->localize( 'inline-edit-post', 'inlineEditL10n', array(
 			'error' => __('Error while saving the changes.'),