Release a user's post lock when the user leaves a post. see #18515.

git-svn-id: http://svn.automattic.com/wordpress/trunk@18796 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/autosave.dev.js

@@ -1,4 +1,4 @@
-var autosave, autosaveLast = '', autosavePeriodical, autosaveOldMessage = '', autosaveDelayPreview = false, notSaved = true, blockSave = false, fullscreen;
+var autosave, autosaveLast = '', autosavePeriodical, autosaveOldMessage = '', autosaveDelayPreview = false, notSaved = true, blockSave = false, fullscreen, autosaveLockRelease = true;
 
 jQuery(document).ready( function($) {
 	var dotabkey = true;
@@ -9,6 +9,7 @@ jQuery(document).ready( function($) {
 	//Disable autosave after the form has been submitted
 	$("#post").submit(function() {
 		$.cancel(autosavePeriodical);
+		autosaveLockRelease = false;
 	});
 
 	$('input[type="submit"], a.submitdelete', '#submitpost').click(function(){
@@ -47,6 +48,22 @@ jQuery(document).ready( function($) {
 		}
 	};
 
+	$(window).unload( function() {
+		if ( ! autosaveLockRelease )
+			return;
+		$.ajax({
+			type: 'POST',
+			url: ajaxurl,
+			async: false,
+			data: {
+				action: 'wp-remove-post-lock',
+				_wpnonce: $('#_wpnonce').val(),
+				post_ID: $('#post_ID').val(),
+				active_post_lock: $('#active_post_lock').val()
+			},
+		});
+	} );
+
 	// preview
 	$('#post-preview').click(function(){
 		if ( $('#auto_draft').val() == '1' && notSaved ) {
@@ -99,9 +116,14 @@ function autosave_parse_response(response) {
 			sup = res.responses[0].supplemental;
 			if ( 'disable' == sup['disable_autosave'] ) {
 				autosave = function() {};
+				autosaveLockRelease = false;
 				res = { errors: true };
 			}
 
+			if ( sup['active-post-lock'] ) {
+				jQuery('#active_post_lock').val( sup['active-post-lock'] );
+			}
+
 			if ( sup['alert'] ) {
 				jQuery('#autosave-alert').remove();
 				jQuery('#titlediv').after('<div id="autosave-alert" class="error below-h2"><p>' + sup['alert'] + '</p></div>');