Thread:NoWayThisUsernameIsAlreadyOwnedBySomeone/@comment-26561761-20151030054948/@comment-26143371-20151030192019

Yeah, it's a change wikia did recently: w:User blog:Kirkburn/Technical Update: October 26, 2015. You can disable it in your preferences at "Editing -> Editing experience -> Do not show syntax highlighting in Source mode". However it will disable all syntax highlighting, so you will get a blank background when editing pages.

As a side note: If code is intended to be read and written by humans and you need your editor to wrap the lines for you, then this clearly indicates that there is something wrong with how your code was written :)