I reported this on the mailing list, but I'll put it here for reference since the issue is still unresolved.

I am parsing an email message that came in as a GitHub comment. I want to
get the plain-text part converted to HTML (yes, I know there is an HTML
part I could have used).

However, when I try to convert the plain-text to HTML by using the
GMimeFilterHTML I end up with missing the plain-text link that is at
the very end of the message. It seems to be simply ignored. I have tried
turning on-off some of the filter options, but to no avail.

I am using a gmime_iostream wrapper [0] or originally from [1], the code
that does the parsing is also online [2].

If I add a newline to the message source right before the second: 

----==_mimepart_540ffd23a9176_53cd3ffb4d3fb2bc2852c3

the message parses as it should. Is this something I am doing wrong or
is this a bug?

Excerpts of the problematic email is included below, hopefully this is
sufficient to show the problem.

Jeff suggested this might be because I am pulling data through the filter as opposed to pushing the data through, I tried debugging, but could not concluded with what is the reason.

The original discussion: https://mail.gnome.org/archives/gmime-devel-list/2014-September/msg00000.html

[0] https://github.com/gauteh/astroid/blob/master/src/gmime_iostream.cc
[1] http://the-ner.org/
[2] https://github.com/gauteh/astroid/blob/master/src/chunk.cc#L137


Cheers, Gaute


Mime-Version: 1.0
Content-Type: multipart/alternative;
 boundary="--==_mimepart_540ffd23a9176_53cd3ffb4d3fb2bc2852c3";
 charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: list


----==_mimepart_540ffd23a9176_53cd3ffb4d3fb2bc2852c3
Content-Type: text/plain;
 charset=UTF-8
Content-Transfer-Encoding: 7bit

messagecontent.

---
Reply to this email directly or view it on GitHub:
https://github.com/sup-heliotrope/sup/issues/326#issuecomment-55080027
----==_mimepart_540ffd23a9176_53cd3ffb4d3fb2bc2852c3
Content-Type: text/html;
 charset=UTF-8
Content-Transfer-Encoding: 7bit

<p>messagecontent</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">&mdash;<br>Reply to this email directly or <a href="https://github.com/sup-heliotrope/sup/issues/326#issuecomment-55080027">view it on GitHub</a>.<img alt="" height="1" src="https://github.com/notifications/beacon/56827__eyJzY29wZSI6Ik5ld3NpZXM6QmVhY29uIiwiZXhwaXJlcyI6MTcyNTk1MzE4NywiZGF0YSI6eyJpZCI6NDIwNDY3OTZ9fQ==--81335445e04e60c40309a26418c095a0a3c8c1e8.gif" width="1" /></p>
----==_mimepart_540ffd23a9176_53cd3ffb4d3fb2bc2852c3--