This is a regression introduced by https://gerrit.wikimedia.org/r/#/c/156237/5/resources/src/mediawiki/mediawiki.jqueryMsg.js,unified and specifically the .html() call on line 1139, which has the effect of flattening the link into its html code in the final rendered message.

The broken message is in UploadWizard: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/908

The affected message calls .msg() with these kinds of parameters: .msg( 'api-error-duplicate', [1, foo] ) where "foo" is a callback function, to be executed on click of the extLink.

To view this issue live, just deliberately re-upload an existing file with Upload Wizard.

Version: 1.24rc
Severity: normal