krasimir added a comment. Re: "I tried to write a test for this, and convinced myself that while +1 is correct, it is currently impossible to change behavior based on the missing +1.": In order to have different outcome based on the start column, you could use tabs. Consider the content `"aaa\tb"` with 4 spaces of tabstop. This takes up 5 columns (say, under the column limit) if it starts at column 0, and 8 columns (say, over the column limit) if it starts at column 1.
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