[PyQt] Using __hash__ functions for custom classes

[Stephen Knox]

Noob question here.

Is there any guidance on how to implement __hash__ functions for custom
classes. Should they be generated automatically if there is a qHash
function?

I am trying specifically to debug this issue:
https://github.com/qgis/QGIS/issues/29225, which is caused by the
QgsActionScope class not having a hash function. There is an __eq__
function but no __hash__ function.

Code is at
https://github.com/qgis/QGIS/blob/master/src/core/qgsactionscope.cpp,
https://github.com/qgis/QGIS/blob/master/src/core/qgsactionscope.h and
https://github.com/qgis/QGIS/blob/master/python/core/auto_generated/qgsactionscope.sip.in
.

I have tried implementing a special-method in the sip.in file but can't
seem to get the syntax right, and I am unsure whether this is necessary or
not.

Thanks

Stephen
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