display treemap root with opacity 1

- also update the treemap baseline which now fails both locally and on the CI

Author: archmoj

src/traces/treemap/attributes.js

@@ -147,8 +147,9 @@ module.exports = {
             max: 1,
             dflt: 0.5,
             description: [
-                'Sets the base opacity of the headers based on the depth from the entry.',
-                'This options is not available when having a `colorscale`.'
+                'Sets the base opacity of the headers above root based on the depth from the entry.',
+                'Please note that the root itself would be drawn with opacity 1.',
+                'This options is not available when having a `colorscale`.',
             ].join(' ')
         },
 

src/traces/treemap/style.js

@@ -61,7 +61,8 @@ function styleOne(s, pt, trace, opts) {
         opacity =
             trace._hasColorscale || helpers.isLeaf(pt) ? 1 :
             pt.onPathbar ? trace.pathbar.opacity :
-                depthFade(pt.data.depth - trace._entryDepth);
+                helpers.isHierarchyRoot(pt) ? 1 :
+                    depthFade(pt.data.depth - trace._entryDepth);
     }
 
     s.style('stroke-width', lineWidth)