better default order for multiple hovers

[nicolaskruchten]

Closes#3389 AND closes#3050 :)

[nicolaskruchten]

Note that this makes #2970 a bit worse, because it'll show only 'min' and not 'median' any longer, because that's now the first hover.

[nicolaskruchten]

LMK if you like the fix and I'll fix the tests

[etpinard]

Thanks for the PR!

Going from:

to:

is amazing 🎉

I'm a little confused about why your patch works though.

Fx.hover doesn't seem to care about the ordering of the labels of vertical box/violin traces and of horizontal box/violin traces under hovermode:'y'. I'll try to dig a little deeper. Maybe Fx.hover is just missing a .sort() for horizontal labels.

[nicolaskruchten]

Hehehe like I said, I just looked at it and thought "seems like they're laying out in order and jamming each other up" ... I didn't dig into the root cause at all, but if there's a deeper/more elegant fix I'm all for it.

[etpinard]

My attempt in -> #3401