Use a lighter default colour for visited links.

https://bugs.corefiling.com/show_bug.cgi?id=40263
Make preview and diff panels scrollable

https://bugs.corefiling.com/show_bug.cgi?id=40263
Move link to renamed page into the main page content panel.

https://bugs.corefiling.com/show_bug.cgi?id=40263
Remove trailing whitespace from Attachment page header link.

https://bugs.corefiling.com/show_bug.cgi?id=40263