[mu4e bug] "replied" flag is not set after sending a reply

[vladmaraev]

Describe the bug

I don't quite understand the mechanics of setting "replied" flag and In-Reply-To field, but I don't see In-Reply-To field while composing a message (I think I could see it in previous versions of mu4e). After sending, the incoming message doesn't get flagged with "replied" flag.

When examining raw contents of incoming messages I see that:
For incoming message
Message-ID:
AS8P251MB02623BAA6AD3F7419E1A9ED1CB8F2@AS8P251MB0262.EURP251.PROD.OUTLOOK.COM
For my reply:
In-Reply-To: AS8P251MB02623BAA6AD3F7419E1A9ED1CB8F2@AS8P251MB0262.EURP251.PROD.OUTLOOK.COM
(REDACTED's message of "Thu, 22 Aug 2024 15:08:39
+0000")

In the thread view these messages look as they should.

How to Reproduce

It happens each time I reply (mu4e-compose-wide-reply).

Environment

• GNU Emacs 29.4 (build 1, aarch64-apple-darwin23.5.0, NS appkit-2487.60 Version 14.5 (Build 23F79))
• mu4e - mu for emacs version 1.12.6

Checklist

• I am running 1.12.x release
• I can reproduce it in "emacs -Q"

[djcb]

The In-Reply-To field is hidden by default; unhide it through the "Field" menu or by changing mu4e-draft-hidden-headers.

[vladmaraev]

Thanks for you reply. I didn't realise this. But now when I see it it is empty.

[vladmaraev]

Sorry I was mistaken. Now I can see it. But still, I don't get the 'replied' flag after the reply gets sent. I will try my best to further debug it myself.

[vladmaraev]

Just to mention that the issue is still present, even though In-Reply-To matches parent Message-ID.