Ticket #37487: 37487.patch

src/wp-admin/js/post.js

@@ -407 +407 @@
                         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()
-                        }
+                var formData = new FormData();
+                var data = {
+                        action: 'wp-remove-post-lock',
+                        _wpnonce: $('#_wpnonce').val(),
+                        post_ID: $('#post_ID').val(),
+                        active_post_lock: $('#active_post_lock').val()
+                };
+
+                $.each(data, function(key, value) {
+                        formData.append(key, value);
                 });
+
+                if (!navigator.sendBeacon || !navigator.sendBeacon(ajaxurl, formData)) {
+                        $.post({
+                                async: false,
+                                data: data,
+                                url: ajaxurl
+                        });
+                }
         });
 
         // multi-taxonomies