preview-at-point bug on very long lines

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a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math, a very long line with math $x$
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