Set a minimum stop time for all stops

[gfgit]

Problem
Job stops can be of type Normal or Transit.
Transits happen when a train runs through a station without stopping.
Normal stops happen when a train stops at the station.

Normal stop already have the requirement to be at least of 1 minute.
First stop and Last stop are special because they are registered as Normal but must have null duration.
Also Transit stops have null duration.

This means that arrival is equal to departure.
This is correct in theory but in practice it has drawbacks.
On railway timetable graph these stops do not appear well because they are just points instead of vertical lines (top = bottom)

Solution 1
Set minimum duration of 1 minute regardless of stop type.

Solution 2
Custom drawing for stops with null duration