`onClick` event handler doesn't take into account a right-click for Pie Charts.

Reproduction of bug - https://codepen.io/dstender/pen/LYXEGYZ

Simple code example:

var myPlot = document.getElementById('myDiv'),
    data = [{
  values: [19, 26, 55],
  labels: ['Residential', 'Non-Residential', 'Utility'],
  type: 'pie'
}],
    layout = {hovermode:'closest',
              title:'Click on Points'
     };

Plotly.newPlot('myDiv', data, layout);

myPlot.on('plotly_click', function(){
    alert('You clicked this Plotly chart!');
});

I discovered this issue while using the react-plotly.js library. I wanted to handle the left and right clicking of a slice of a pie chart in the same manner. However, I noticed that the onClick event doesn't catch a right click. This is not the case for other charts (Line, Bar, etc...).

It seems to me that this is related to plotly.js rather than react-plotly.js but of course I could be wrong. If this is a legit bug are there any workarounds?

从链接的 CodePen 复现开始，跟踪 Plotly 对饼图点击的处理，并将其与折线图和柱状图的行为进行比较。当右键点击饼图的一个扇区能够稳定地触发 plotly_click 事件，并且针对所报告案例具有回归测试覆盖时，即视为完成。