Word broken even though it would fit on line

[mgeisler]

This test case fails, even though the "qqqqqqqqq" word is only 9 characters long:

    #[test]
    fn test_very_ragged() {
        // Example of inputs that produce very ragged output with the
        // greedy algorithm.
        assert_eq!(wrap("a b c d e f g h i j k l m n o p qqqqqqqqq", 10),
                   vec!["a b c d e", "f g h i j", "k l m n o", "p", "qqqqqqqqq"]);
    }

It fails with

---- tests::test_very_ragged stdout ----
	thread 'tests::test_very_ragged' panicked at 'assertion failed: `(left == right)`
  left: `["a b c d e", "f g h i j", "k l m n o", "p qqqqqqqq", "q"]`,
 right: `["a b c d e", "f g h i j", "k l m n o", "p", "qqqqqqqqq"]`', src/lib.rs:1080:8

[mgeisler]

Bisecting shows that this was introduced back in version 0.7.0 in commit 4313d58 (Wrapper::wrap: return Vec<Cow> instead of Vec).

[mgeisler]

The above test case can be simplified to just

#[test]
fn test_very_ragged() {
    assert_eq!(textwrap::wrap("aaabbbccc x yyyzzzwww", 9),
               vec!["aaabbbccc", "x", "yyyzzzwww"]);
}