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o Major features:
- Increase the base amount of time that a canonical connection
(one that we have made to a known OR) is allowed to stay idle
from 3 minutes to 15 minutes. This leaks less information
about when circuits have closed, and avoids unnecessary overhead
from renegotiating connections. Part of a fix for ticket 6799.
- Instead of closing connections after they have been idle for a
fixed interval, randomly add up to 50% to each connection's
maximum timeout. This makes it harder to tell when the last
circuit closed by looking at when a connection closes. Part of a
fix for ticket 6799.
- Base connection idleness tests on the actual time elapsed since
the connection last had circuits, not on the time when we last
added non-padding. This change also makes it harder for an
observer to tell when the last circuit closed by looking at when
a connection closes. Part of a fix for ticket 6799.
Incidentally fixes bug 12023; bugfix on 0.2.5.1-alpha.
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