Hi @jdhernley, thank you for creating a ticket with your issue!

I think there's no need to add this into a core because it can be easily achieved by synchronizing extremes with a main xAxis and navigator's xAxis. Works with basic features, like e.g. changing extremes, see a demo: https://jsfiddle.net/BlackLabel/8xu0jtpn/

Definitely, I wouldn't consider it as a bug.

Is the above solution OK for you? If yes, please let me know so we can close the ticket as resolved.

Thank you that solved my issue
Actually that causes all of my data to disappear when in boost mode.
False alarm. One problem with this solution is that if I zoom in (for your example a viewport width of 5 points suffices) and then scroll the graph seems to flash as I'm scrolling it. Also, the padding becomes very large relative to the viewport width when zoomed in. It would be nice if the padding was proportional to the view port width of the graph.
@raf18seb

Closing due to inactivity.

@karolkolodziej Why is this closed "due to inactivity"? The problem obviously still exists and I am also waiting for a solution.

You are right! The issue is still visible and I was misled by the labels!

Thank you :-)

A very simple workaround could be to update the navigator's xAxis with new min and max padding: https://jsfiddle.net/BlackLabel/f15uL7b4/ (at this moment we force max and min padding to be zeroed)