In the absence of such a method, I'm doing this:
symbolLayers = {}
for i in xrange(symbol.symbolLayerCount()):
sl = symbol.symbolLayer(i)
if renderer.usingSymbolLevels():
k = sl.renderingPass()
else:
k = i
symbolLayers[k] = sl
stackedSLs = sorted(symbolLayers.iterkeys())
I think it works:
https://github.com/tomchadwin/qgis2web/commit/c5f4d457d32057ab6b6f56abab49d24008d20732
If anyone has a better method, do let me know.
Thanks
Tom
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