sunburst & treemap root color attribute

[thierryVergult]

new attribute for treemap & sunburst traces to set the color of the root node.

Setting the color of the root node of a treemap can also be used to fix the height of a treemap. By default the root node has no color, and when doing a drilldown, the surface of the root nood is overwritten with descendent data. Having a root node color set makes the surface used more prominent visible.

See also #5199

[archmoj]

Please also consider handling the root/trunk color here:

plotly.js/src/traces/treemap/style.js

Lines 50 to 54 in 5d4c888

	if(isRoot && fillColor === 'rgba(0,0,0,0)') {
	opacity = 0;
	lineColor = 'rgba(0,0,0,0)';
	lineWidth = 0;
	} else {

should become something like:

        if(isRoot && fillColor === trace.root.color) {
            opacity = 100;
            lineColor = 'rgba(0,0,0,0)';
            lineWidth = 0;
        } else {

Thanks.

[archmoj]

Then please add root/trunk color equal yellow to all the traces of the following: mocks:
https://github.com/plotly/plotly.js/blob/master/test/image/mocks/treemap_textposition.json
https://github.com/plotly/plotly.js/blob/master/test/image/mocks/sunburst_inside-text-orientation_clock

to regenerate the new baseline:
once

npm run docker -- run 

then

npm run baseline treemap_textposition sunburst_inside-text-orientation_clock

More info: https://github.com/plotly/plotly.js/blob/master/CONTRIBUTING.md#image-pixel-comparison-tests

Also if you had difficulty making these baselines; you could give us (as maintainers) the permission to push to your branch so that I could generate the baselines for you!
see https://github.com/plotly/plotly.js/blob/master/.github/PULL_REQUEST_TEMPLATE.md

Thanks.

[nicolaskruchten]

I like this new attribute in principle :)

[archmoj]

@thierryVergult we are planning next plotly.js minor (possibly next week) to include new features like this one.
Would you please addressing the following comments?
#5232 (comment)
#5232 (comment)
Thanks.

[thierryVergult]

I'm pretty busy these days. Not sure I will find some time this week for further follow up.

[archmoj]

I'm pretty busy these days. Not sure I will find some time this week for further follow up.

Thanks for the info.
💃
And I'll open up a PR shortly to address my comment and add tests.