mdast_util_to_markdown panics while trying to format UTF text with trailing spaces

[johnlepikhin]

Hi there,

There is a bug somewhere in state.rs → container_phrasing(), which makes it panic with the message like "byte index 212 is not a char boundary" at line 245. I reproduced it in simple test: johnlepikhin@e4c451a. Please note that source markdown at lines 7-9 contains sequence:

<UTF-8 character> <SPACE> <SPACE> <NEWLINE>

[johnlepikhin]

Found another case which reproduces probably the same issue: johnlepikhin@3614cbe. The first character in markdown document is UTF-8.

[ChristianMurphy]

The former might be variation on #31
The latter looks like a variant of #22

[bnchi]

I was able to reproduce the issue using the second test case you provided and I fixed it in here #170

Can you check if you can reproduce the panic that's happening in the first test case using the fix provided in the PR ?

[johnlepikhin]

Thank you, @bnchi! Both cases were fixed.