Fixed the per-element opacity on Surface plots
Fixed the per-element opacity on Surface plots

This works only if the global opacity is also specified and <1. To blend different surfaces, an opacity of 0.99 works great.
plotly/plotly.js,plotly/plotly.js,aburato/plotly.js,plotly/plotly.js,plotly/plotly.js,aburato/plotly.js,etpinard/plotly.js,etpinard/plotly.js,etpinard/plotly.js