Map: advanced categorical marker config table could have "checked items at top" toggle

[bobular]

Potential follow-up to #285 / #190

Considerable scrolling might be needed to uncheck an item when we've checked more than 7. This would help! Hasn't been through UX though.

Mesa might give us this for free. We have it already in the big subsetting table

[dmfalke]

It’s not “for free” with Mesa, but we can look at MembershipFilter for implementation reference.

[bobular]

On reflection, I think this should be really low priority. I'm not a big fan of things moving around as soon as you click on them.

[dmfalke]

Note that the recent PR #1017 will make this a little bit easier.