Allowing display filters during capture

[Avaneesh Kadam <avaneesh.kadam () gmail com>]

Can we remove following tshark check?

==
main()
{
   if (global_capture_opts.saving_to_file) {
     if (dfilter != NULL) {
        cmdarg_err("Display filters aren't supported when capturing and
saving the captured packets.);
        *return 1; //remove this check to allow DF while capturing.*
*     }*
 }
}
==

I was looking following command to work:
==
tshark -Y "udp.port==137" -f udp -x -w udp_all.pcap
==

Eg. Above command will capture and save all UDP packets and display only
the ones with port as 137.

By removing above check I could get this to work, although I have not done
thorough testing yet.

I am new to Wireshark development culture, so please let me know if we
discuss such issues here or through bugs.

I did some investigation on why this restriction was put, looks like this
was present from day 1 of display filter (-Y).

--
Thanks,
Avaneesh

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