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Undo last vertex added in Geoprocessing widget tool?

Question asked by JohnGrogan on Mar 10, 2016
Latest reply on Apr 28, 2016 by JohnGrogan

I have a Geoprocessing service (written in Python) used in a WebAppBuilder application (Geoprocessing widget). For a GPFeatureRecordSetLayer parameter the drawing tools work well, but when the Escape key is pressed I would like to undo the last vertex digitised rather than delete the complete shape.  I am fairly proficient in Python, but less so in JavaScript/widget customisation.  Any advice welcome.