[imp] pgp-encrypted emails blowing up session

[Oliver Kuhl]

Hi,

it's me again! ;-)

There seems to be another issue with encrypted emails. As I found out, 
decrypted emails are saved in the session. But those data seems not to 
be reused when I open the same enctypted email again.

I looked at the size of my session and found out that reading encrypted 
emails blows the session, because the decrypted email seems to be saved 
in the session everytime I open it again and again.

Here is the size of my session after every time I opened the same email:

# ls -la /tmp/sess_7e2b79b579fc0baf37603f9e464e4d22 (several times)
  914386 Apr 14 08:02 /tmp/sess_7e2b79b579fc0baf37603f9e464e4d22
1575316 Apr 14 08:03 /tmp/sess_7e2b79b579fc0baf37603f9e464e4d22
2236257 Apr 14 08:03 /tmp/sess_7e2b79b579fc0baf37603f9e464e4d22
2897198 Apr 14 08:04 /tmp/sess_7e2b79b579fc0baf37603f9e464e4d22
3558139 Apr 14 08:04 /tmp/sess_7e2b79b579fc0baf37603f9e464e4d22
4219080 Apr 14 08:05 /tmp/sess_7e2b79b579fc0baf37603f9e464e4d22

Sorry I don't come up with patches. But the MIME-stuff in IMP is really 
magic and nothing for patching around without understanding it. Maybe 
one of the developers has an idea and quick solution... :)

Gruss,
    Ollie.