gfm: line wrapping interaction with hard_line_breaks

[arcnmx]

Explain the problem.

Newlines generated due to --wrap=auto mangle the output when combined with +hard_line_breaks:

$ for i in {0..20}; do echo hello; done | pandoc -f gfm -t gfm+hard_line_breaks
hello hello hello hello hello hello hello hello hello hello hello hello
hello hello hello hello hello hello hello hello hello
$ for i in {0..20}; do echo hello; done | pandoc -f gfm -t markdown+hard_line_breaks
hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello

Using --wrap=preserve is even worse!

Pandoc version?

pandoc 2.17.1.1
Compiled with pandoc-types 1.22.1, texmath 0.12.4, skylighting 0.12.3, citeproc 0.6.0.1, ipynb 0.2

EDIT: sorry, just realised my version is out of date - I'd appreciate if someone with 2.18 could let me know if this is no longer relevant

[jgm]

Still relevant with 2.18 - but now fixed in HEAD.