Add try_wrap function
#547
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`try_wrap` is identical to `wrap` except that it returns the display widths of the wrapped lines rather than actually wrapping the given text. The tests are also borrowed from `wrap`'s.
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try_wrapis identical towrapexcept that it returns the display widths of the wrapped lines rather than actually wrapping the given text. The tests are also borrowed fromwrap's.The proposal was suggested in issue #545.