Using CondensedInlinePanel makes Wagtail always detect changes

[kaedroho]

If you open a page that has a CondensedInlinePanel in the page editor, then try to leave without changing anything, Wagtail will prompt you with a message like "There are unsaved changes, are you sure you want to leave this page?".

I think the issue is caused by condensed inline panel writes to the underlying hidden fields on start up, making Wagtail think something has been changed.