I use KDE's Kate
editor a lot. Recently, it has complained about opening some of my messy HTML files, giving the following slightly opaque error message:
The file [whatever] was opened and contained too long lines (more than 1,024 characters). Too long lines were wrapped and the document is set to read-only mode, as saving will modify its content.
I searched for a portion of this text using Startpage
and found just one result, in a post to the kde-commits list