Hi! Unfortunately, it is 5 am here, so I can't remember (and can't google for it right now) the number of RFC describing subject header splitting rules, but I do remember, that it forbids splitting characters and states that split should be before the first byte of the character in that case. And also I do remember, that there probably was similar bug in old kmail from the times of kde3. Anyway, the problem is in that fact, that messagelist doesn't concat that splitted-in-the-middle characters in the Subject header, and render two (in case of utf8) diamonds instead. Other clients (Thunderbird, Outlook and so on) do show it normally. Attachments: screenshot, demonstrating problem mbox-exported message from screenshot (with stripped body, bue to sensitive content). Reproducible: Always
Created attachment 98049 [details] Screenshot, that demonstrates the problem
Created attachment 98050 [details] (mbox-exported message from screenshot)
As you can see in attached message, there is splits just in the middle of character (between 0xd0 byte and "informative" byte) > =?utf-8?Q?=d0=b4=d0=b0_=d0=b2_=d1=86=d0=b5=d0=bd=d1=82=d1=80_=d0=bf=d0?= > =?utf-8?Q?=be=d0=bb=d1=8c=d0=b7=d0=be=d0=b2=d0=b0=d1=82=d0=b5=d0=bb=d0?= and exactly in that places messageviewer renders two diamonds instead of character.
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Yes, I do. Just tested with Kontact 5.21.2