Add self as the first argument to method #468
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fixes #393
This PR simply adds self as the first argument to the
draw_imageabstract method.I believe this was previously inconsequential because this method is always intended to be overridden. Those overriding it add the self argument. Apparently
@abstractmethoddoesn't strictly enforce the signature of the method, so subclasses / registered classes are free to change the signature.In any case, this method should still take
selfas its first argument.