Add option for setting lt::settings_pack::hashing_threads
introduced by libtorrent 2.0. It has no effect for earlier
libtorrent versions.
Use 10 async IO threads, as per #11461.
Closes#11461.
Don't hardcode lt::settings_pack::no_connect_privileged_ports. We
support the peer alert for it already, so connections blocked by this
setting should be logged.
This PR exposes the LibTorrent Peer Turnover Settings in qBT Advanced Settings in order to allow users to adjust how frequently slow and uninteresting connections are closed to allow potentially better / faster connections to be made.
The default settings are to turnover peers when the number of connections is at least 90% of allowed global or per torrent connections, and to disconnect the least attractive 4% of these connections every 5 minutes.
See https://www.libtorrent.org/reference-Settings.html#peer_turnover
This commit adds a new libtorrent setting to validate HTTPS tracker
certificates. When enabled, libtorrent will validate the certificate
of HTTPS trackers against the system's certificate store. This option
is only enabled on libtorrent versions >= 1.2.6 and on non-Windows
systems, as OpenSSL does not use the system's certificate store on
Windows.
This is a new setting added that is pending addition to
libtorrent 1.2.6. This setting is important because some routers do
not support expiration times on port-maps and do not return an error
either, silently failing. The previous default of permanent leases is
retained.
This is to avoid Windows swapping out other application data from
OS cache and put in torrent data which hinders other program
responsiveness.
The default value "Below normal" is choosen because casual users have
other higher priority apps (such as browser) running and they don't
expect OS to swap out its data. Dedicated seeders most probably will not
have other app running on their system and would expect qbt has
priority over other background services.
The option only has effect on Windows >= 8.
The default value in libtorrent is 5 which is too small nowadays.
The new default value 30 is chosen to be in line with
QTcpServer::maxPendingConnections().
