[sylpheed:31684] sylpheed should remove stale socket on startup

[Evgeni Golov]

Hi,

I had to kill sylpheed some minutes ago (it hung because of network
problems) and it did not want to start again.
After firing up strace, I found sylpheed hanging
on /tmp/sylpheed-<MyUID>. This was still there after I killed sylpheed.

As I think a normal user would not try to run strace to find out, why
the program hangs, sylpheed should always remove an existing socket on
startup and then create a fresh one instead of trying to reuse the old
(maybe broken) one.

Regards
Evgeni

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