@nicolaskruchten ready for review..
rearanging my commit order didn't work when force pushing.. I guess github UI orders them by time of commit..this is the order I wanted to have:

pick 811a316 create DTicksInterval to keep visibility rules
pick 97a5958 AxisInterval adjustments for Axes Panel
pick 4bf4821 Add AxisInterval to ColorBars

Looks great!

Some oddities though, when switching into 'custom' spacing mode and then switching from days to months ... Can we do something smart with the initial value here or... ?

I think the behaviour above is related to https://github.com/plotly/streambed/issues/11864

I can reproduce the off default value behavior in this codepen: https://codepen.io/veraz/pen/VqQQGj?editors=0010, issue opened in plotly.js here: plotly/plotly.js#3395

OK, 💃