Labels for charts can be hidden behind objects rendered after them.

[g1eng]

Problem

Labels for pie charts can be hidden with arcs rendered after them.
For example, an arc for the last datum can be put over the label for the first datum of pie chart:

Also nested pie (or doughnut) can hide labels for other pie charts' labels:

A layered chart with shared drawing area for two or more layers has this type of problem

Cause

Layer.setLabel simply add SVG elements to the layer when it is invoked. So newer layers added after that, are placed in front of layers drawn in past and can hide any labels of that layers.

Proposal

Change order to invoke setLabel, or rearrange all labels in front of any object after rendering