Zoom range for Diversity view is changed after every click on a new bar

[corneliusroemer]

Current Behavior
When I zoom into a gene in the diversity view and click on a tip, the zoom range resets. In particular, there seems to be a 'minimum range' that you can't maintain. Auspice will always force the range to be wider after every click. I don't understand why a user would want this. I set the range to whatever I want it on purpose, if it's zoomed out it becomes hard to click.

Expected behavior
I want the width of the zoom range to stay maintained after clicks.

How to reproduce
Steps to reproduce the current behavior:

1. Set zoom range to something narrow
2. Click on a tip
3. Observe the new zoom range

Your environment: if browsing Nextstrain online
Happens on Firefox and Brave

Before step 2 (having set narrow zoom range):

After step 2 (click): range has been broadened

[jameshadfield]

This would be a good improvement I think. I'm changing labels here, as I believe this behavior was intentional when it was implemented, albeit quite some time ago.

I'll note one case to consider during implementation: when changing to a genotype outside the current zoom range, which can happen in narrative mode or via the sidebar dropdown, we do want to change the selected zoom range.

[corneliusroemer]

Thanks for the clarification. For smaller genomes like flu HA the minimum zoom range may have made sense.

As a quick fix, would it be possible to change the value of the minimum zoom range?

Is it quantified in terms of proportion of genome, e.g. at least 15% or in terms of nucleotides? I could imagine the problem is that it's proportion as opposed to number of nucleotides.

[jameshadfield]

It appears to try to use gene boundaries for aa mutations, and 5% if nucleotide.