Distance traveled incorrect when moving stops up/down a loop pattern

[binh-dam-ibigroup]

Observed behavior (please include a screenshot if possible)

When moving stops up and down a pattern where a previous stop is repeated later, shape_dist_traveled in stop_times.txt are incorrectly updated: the distance traveled when a repeated stop is hit first is higher than subsequent stops, so distances do not appear in increasing order, causing validation errors with the MobilityData validator.

Expected behavior

shape_dist_traveled for repeated stops in stop_times.txt should be updated correctly.

Steps to reproduce the problem

In the GTFS route editor:

1. Open a route pattern or create one as a big loop (where the trip returns to some of the first stops in the pattern).
2. Move a not-repeated stop in that pattern up or down the list.
3. Take a editor snapshot and publish it as a new version
4. Observe the extra MobilityData validation errors regarding distance traveled not in order.

Any special notes on configuration used

NA

Version of datatools-ui and datatools-server if applicable (exact commit hash or branch name)

Recent datatools-ui dev branch.