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Maurice
15beb0ea40
The schedule only ever walked forward, so a stop before the first pinned time stayed blank. That is the wrong way round for how people plan: the museum opens at ten, so when do we have to leave? Pinning the time on the second stop and reading the first one's departure off the chain is the whole point of pinning it. The chain now runs both ways — forward from the first known arrival as before, backward for everything ahead of it, departure being the next arrival minus the drive and arrival that minus the stay. It stops at a leg that never routed rather than inventing a duration, and when working back crosses midnight the whole chain shifts up a day so the earliest stop stays on day zero and the boundary is drawn between the two stops instead of under the first one.