Post locks and autosave:

- Move nonces refreshing from autosave to lock checking.
- Do autosave only when there is something to save.
See #23295

git-svn-id: http://core.svn.wordpress.org/trunk@24209 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/post.js

@@ -252,7 +252,10 @@ WPRemoveThumbnail = function(nonce){
 };
 
 $(document).on( 'heartbeat-send.refresh-lock', function( e, data ) {
-	var lock = $('#active_post_lock').val(), post_id = $('#post_ID').val(), send = {};
+	var lock = $('#active_post_lock').val(),
+		post_id = $('#post_ID').val(),
+		post_nonce = $('#_wpnonce').val(),
+		send = {};
 
 	if ( !post_id )
 		return;
@@ -262,6 +265,9 @@ $(document).on( 'heartbeat-send.refresh-lock', function( e, data ) {
 	if ( lock )
 		send['lock'] = lock;
 
+	if ( post_nonce )
+		send['post_nonce'] = post_nonce;
+
 	data['wp-refresh-post-lock'] = send;
 });
 
@@ -286,7 +292,9 @@ $(document).on( 'heartbeat-tick.refresh-lock', function( e, data ) {
 					});
 
 					// Save the latest changes and disable
-					autosave();
+					if ( ! autosave() )
+						window.onbeforeunload = null;
+
 					autosave = function(){};
 				}
 
@@ -301,6 +309,13 @@ $(document).on( 'heartbeat-tick.refresh-lock', function( e, data ) {
 		} else if ( received.new_lock ) {
 			$('#active_post_lock').val( received.new_lock );
 		}
+
+		if ( received.update_nonces ) {
+			$.each( received.update_nonces, function( selector, value ) {
+				if ( selector.match(/^replace-/) )
+					$( '#' + selector.replace('replace-', '') ).val( value );
+			});
+		}
 	}
 });