1930358 - list-id does not trigger threading in threaded mode

Status: RESOLVED INVALID

(Thunderbird :: Folder and Message Lists, defect)

Description

[monperrus]

Action:

• Subscribe to a mailing-list
• Receive multiple messages with header List-id

Expected behavior:

The messages are threaded when in threaded mode

Actual behavior:

The messages are not threaded, header List-id is not considered

Comment 1

[Magnus Melin [:mkmelin]]

List-Id is unrelated to threading. Threading uses References and In-Reply-To headers.

Comment 2

[monperrus]

Thanks for your answer.

This is the point of this report:

Threading should use "List-id" in addition to References and In-Reply-To headers.

This is because all messages in the same list are conceptually related and are better read together.

Comment 3

[Magnus Melin [:mkmelin]]

They are of course related, but certainly not the same thread.
There's no reason they wouldn't have the usual headers and threading works the way it's supposed to.

Comment 4

[monperrus]

What I suggest is fully backward compatible, and we keep threading as it's supposed to work.

We would augment threading as follows:

If we have References or In-Reply-To:
  // same as usual
else If we have List-id
  // new threading per list as in https://bugzilla.mozilla.org/show_bug.cgi?id=1930358
else:
  // no threading

By doing, when reading one's inbox, we can read all emails from the same list at once, which is better.

Comment 5

[Magnus Melin [:mkmelin]]

I don't think that would be better. There would then be unrealated (apart from being from the same list) threaded together.
It's usually a good idea to filter list mails into their own folders.

Comment 6

[monperrus]

Hi Magnus,

Thanks for the tip, that would be better for those who do not use one folder per list.

One may have 20+ lists in the same inbox.