fmt: --goal produces different output than GNU fmt #5162
Description
When using -g/--goal, the output differs between uutils fmt and GNU fmt:
// uutils fmt
$ cargo run fmt tests/fixtures/fmt/one-word-per-line.txt --goal=7
this is
a file
with one
word per
line
// GNU fmt
$ fmt tests/fixtures/fmt/one-word-per-line.txt --goal=7
this is a
file with one
word per line
A test case for this issue was added in https://github.com/uutils/coreutils/pull/5159/files