Hello

A Debian user reported:

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   * What led up to the situation?
Pan crashes before downloading all headers on at least some newsgroups. When it does,
it loses the downloaded headers. When I attempted to circumvent this behaviour by
stopping the task before it completed, then shutting down and restarting pan, the
task vanished, as did all the headers it had downloaded.

   * What exactly did you do (or not do) that was effective (or ineffective)?
The workaround seems to be download only a specific number of days worth of headers
until I hit the number that makes pan crash. However this can be a lot of headers
so the process can take days, maybe weeks.

   * What outcome did you expect instead?
1) the download all headers task should be restartable after shutting down pan, or
2) the download all headers task should save the headers list periodically, or
3) there should be an option to download a range of headers (by date). e.g. 
   download headers from 365 days ago to 730 days ago.

At the very least, pan should remember the headers that were downloaded when the
download all headers task was stopped. These shouldn't vanish after a restart.

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See original bug report:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=821344

All the best