GanttChart
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Update gantt_chart_resource.js
Fix : uncaught typeerror: 'set' on proxy: trap returned falsish for property 'class'. On Winter 20 SFDC release
This didn't fix for me; it creates a new allocation object (avoiding the error) but loses all of the original properties on the original allocation object. See https://github.com/SalesforceLabs/GanttChart/pull/2 for a working fix.