An assistant can now take back a change it saved with save_tour_change,
the way the change was saved: listed, shown, then taken back only after
the traveller said yes. Until now a saved step could be followed but not
undone; the traveller had to rebuild the walk by hand in the planner.
- list_tour_change_steps lists the steps of a tour, the latest first, with
the changes as confirmed and where each stands: latest, undone, later
change on top or no readable earlier state. Planner saves are no steps.
- prepare_tour_undo shows what taking a step back does without writing
anything: the tour now, with the stations visited or skipped, set
against the tour exactly as the step kept it, the stations kept, coming
back and removed, and the distance and walking time stored then.
- undo_tour_change restores that tour whole or not at all, through the
write the planner's save uses: line, stations with their keys and the
measures stored then, in one transaction with the mark on the step, and
the trip is told after the commit. It needs place editing on the trip
and checks everything again inside the write.
- Only the tour's latest change goes back. A step something was saved on
top of since, in the planner or by another step, is a conflict on the
tour's one revision (no second one), so no later edit is lost unseen; a
preview read at another revision is a conflict too. Taking back a step
that would remove a station visited or skipped since, or bring back a
station whose place of the trip is gone, is refused with every reason,
and so is a step without a readable earlier state. Every refusal and
failure leaves the tour as it is.
- A step is taken back once: tour_change_steps records the revision that
raised the tour to, who confirmed it and when, and nothing else is kept.
- None of it touches a planner draft: the planner's own undo stays in the
browser, and discarding a draft never changes a saved tour. The tool
descriptions and the wiki say so.
The write of a tour's line and points and the tour as the answer gives it
now come from one place for the save and the undo.
Maurice
63a7a4d397