I just got a bug report for my Attachments extension, apparently if it's used along with the VisualEditor extension and a page is saved with the visual editor the page content get temporarily duplicated till the page is refreshed.
My Attachments extension displays the attachments of a page below the page content, and to get external links within the attachments section to be styled like in the page content I am wrapping the attachments section in a <div class="mw-parser-output"> so that e.g. the Vector skin applies its .mw-parser-output .external CSS rule.
Line 1382 of ve.init.mw.DesktopArticleTarget.js however does the following:
this.$editableContent.find( '.mw-parser-output' ).replaceWith( $content );
which unfortunately also finds the div added by my extension, leading to the initially linked bug.
So I am wondering if it would be possible to change the above mentioned line to:
this.$editableContent.find( '.mw-parser-output' ).first().replaceWith( $content );
which according to my jQuery knowledge should do the trick and skip the second .mw-parser-output div added by my extension.