The <form> around the image revision list has no action= attribute causing the "Show difference between selected revisions" button to fail when a certain action (like uploading) was done before.
To reproduce:
upload an image
select a different image
go to history tab
select two revisions
hit "Show difference between selected revisions" button
The
<form>around the image revision list has noaction=attribute causing the "Show difference between selected revisions" button to fail when a certain action (like uploading) was done before.To reproduce: