More complex flow charts may have objects with lines that both start and terminate at the same position on shape. This can make it challenging to determine which line is going in which direction. The ability to show an arrow on the line indicating the proper direction would make this easier to identify and improve visualization for both the creator and reviewers of the chart.
Today it is possible to add a “marker” to a line. Providing the ability to customize that icon using the current endpoint options would seem like a potentially quick solution to this problem.


