Markdown header is incorrectly broken into multiple lines (and displayed strangely)

[lebigot]

I have this .ipymd notebook with a simple one-line, long header:

# This is an example of a long header, with many, many words. This really is an example of a long header, with many, many words.

notedown incorrectly produces the following Markdown:

# # This is an example of a long header, with many, many words. This really
is an example of a long header, with many, many words.

I see two problems:

• Big problem: there should be not line break (after "This really").
• The (say HTML) rendered output should not show "# This is an example…" but "This is an example…", like in the notebook, right?

I could not find where in the code the header is broken.

More generally, the Markdown from Markdown cells should probably be left untouched too, no?

[aymaliev]

Hello,

This happens with every long line, not just headers.
I am also looking for a solution to this issue.

Meanwhile, @lebigot , you can use html syntax as a workaround. <h3> this very long title will not be incorrectly broken into multiple lines, even if it is very very long.</h3>

[ObserverOfTime]

I've also encountered this issue. Are there plans to fix it?

Edit: I found a fork that works. It's also on PyPI.