I’d like to be able to highlight the wrap margin/text width in vim by changing the background color (or maybe just a line?). A lot of IDEs have this. I mocked up what I’m talking about:

Anyone know if this can be done in macvim or gvim?
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Try this:
It will highlight text beyond 80 characters, you can replace ’80’ with whatever wrap-width you have. However, it will only highlight the characters that exceed the width, and then only on lines that are actually longer than the width.
Check http://vim.wikia.com/wiki/Highlight_long_lines for more info, but they all pretty much accomplish the same thing.