kangax/fabric.js — pull request #1405 by asturur (2014-06-19 08:46:11+00:00)
Title: Managing opacity properties on polygon and path object

Adding:
ctx.globalAlpha = this.group ? (ctx.globalAlpha * this.opacity) : this.opacity;
after ctx.beginPath(); on path and polygon class.
it fixes rendering on this svg from actual kitchensink

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