[Kde-pim] [PATCH] fix threading in KMail

[Tobias König]

Hej,

the brave users of KMail2 will already have noticed that threading is broken 
in KMail in 4.5 branch and trunk. The reason is that the findMessageParent
logic in messagelist cannot determine the right parent via the In-Reply-To and 
References field and therefor falls back to subject comparison.

The In-Reply-To and References comparison fails because the used Message-Id
fields are in the form of '<someuniqueid>' but the used In-Reply-To and 
References fields look like 'someuniqueid', so they are missing the angle 
brackets. The attached patch fixes this inside the messagelist code, however I 
guess the real bug is in libkmime, which (for some unknown reason) suddenly 
strips the angle brackets. Since threading (based on messagelist code) works 
fine in KDE 4.4 this is a regression in KMime IMHO.

Any ideas?

Ciao,
Tobias
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