[QGIS-Developer] QGIS3: Python QgsFeatureRenderer subclass problem

[Chris Crook]

I am converting a python  plugin the implements a subclass of QgsFeatureRenderer.  At the moment the plugin is dying on the startRender function with the message (from the base class)

"ASSERT failure in QgsFeatureRenderer::renderFeature: \"renderFeature called in a different thread - use a cloned renderer instead\"

I can't see where I should be creating the cloned renderer for the rendering.  I had a look at the QgsSingleSymbolRenderer C++ code and I can't see anything there, so I'm wondering if the python implementation in some way corrupts the multiprocessing implementation.  Can anyone offer any suggestions

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