On Tuesday, October 1, 2013 12:04:06 PM UTC-5, David Barnett wrote:
> Even if the language syntax mandates maximum line lengths, you probably don't 
> want to force +t. This will insert line breaks even in the middle of string 
> literals, and it's a pain for users to figure out what happened, undo the bad 
> linebreak, then fix the long lines properly. It would be better to find a 
> syntax-aware method of breaking long lines, or failing that, leave it up to 
> users. Anyway, the default is 'tcq', so forcing +t won't do anything except 
> fight with users who have explicitly disabled it.
> 
> 
> 
> I've seen lots of HighlightLongLines hacks floating around, and they're all 
> brittle (e.g., they don't catch updates to &textwidth, and they don't 
> cooperate well with other syntax files). It would be nice if vim officially 
> supported something for it in addition to &colorcolumn (e.g. highlighting 
> ONLY long lines so you can give them a screaming red color and not make other 
> lines look ugly). Then if it's truly part of the standard, you have options 
> to bake that into the built-in files.
> 

I once used a variant of this:

http://vim.wikia.com/wiki/Highlight_long_lines#Toggle_matching_based_on_textwidth

which would fire on autocmds (I think it was WinEnter and CursorHold) to 
re-apply the highlight based on textwidth.

But then colorcolumn was introduced and I got rid of it.

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