Wireshark · Wireshark-dev: [Wireshark-dev] question about TCP flag DESEGMENT_UNTIL_FIN

["yin sun" <sunyin51@xxxxxxxxx>]

Hello,
I found out that,
When a subdissector on top of TCP set    
   if (pinfo->can_desegment) {
        pinfo->desegment_len = DESEGMENT_UNTIL_FIN;
        return;
    } 
when pinfo->can_desegment is 0 again, subdissector received the whole TCP stream in tvb 
minus the payload from the FIN packet.

Is this by design? or by mistake? 

Thanks,
/Yin