Several BODY[...] sections are parsed incorreclty

[lpld]

I'm trying to load a message with BODY[TEXT] and BODY[HEADER]:

imapClient.uidfetch(
   Set.of(106),
   FetchDataItemType.UID,
   new BodyPeekFetchDataItem("TEXT"),
   new BodyPeekFetchDataItem("HEADER")
)

According to the trace logs, everything is fine:

2021-01-06 17:44:29,651 [info] c.h.i.c.I.unknown-client - SEND: A002 UID FETCH 106 (BODY.PEEK[TEXT] BODY.PEEK[HEADER] UID)
...
2021-01-06 17:44:30,345 [info] c.h.i.p.R.unknown-client - RCV(FETCH): (UID 106 BODY[TEXT] {4043}
...
2021-01-06 17:44:30,347 [info] c.h.i.p.R.unknown-client - RCV(FETCH):  BODY[HEADER]
...

Not posting the whole log, because it's quite huge, but it's clear that the server returns both BODY[TEXT] and BODY[HEADER] sections.

However, the resulting ImapMessage object doesn't include text body. getBody returns org.apache.james.mime4j.dom.Multipart with 0 parts.

I debugged the code a bit. Looks like each of the sections is parsed separately, and then the "header" section overwrites the "text" section in the resulting ImapMessage. If I don't query header, there's no issue - the body contains the text.

I don't know if this can be fixed somehow with current ImapMessage implementation. It has only one body property, and it's not clear how to combine all the sections into a single org.apache.james.mime4j.dom.Message, but current behavior definitely looks wrong.