Users report today that on page source editing JavaScript crashes frequently but unpredictable and not reproducable.
1.28.0-wmf.7 deployed yesterday on German Wikipedia.
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Report caught as follows.
TypeError: $form.serializeObject is not a function stashEdit/<() load.php:162 .Deferred/promise.then/</</<() load.php:47 jQuery.Callbacks/fire() load.php:45 jQuery.Callbacks/self.add() load.php:45 .Deferred/promise.then/</<() load.php:47 .each() load.php:5 .Deferred/promise.then/<() load.php:47 .Deferred() load.php:47 .Deferred/promise.then() load.php:46 stashEdit() load.php:162 onFormLoaded() load.php:163 <anonym> load.php:163 jQuery.Callbacks/fire() load.php:45 jQuery.Callbacks/self.fireWith() load.php:46 .ready() load.php:49 completed() load.php:49 load.php:162:1334