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fix: Compare node class if subclassof

Fabien Amarger requested to merge topic/default/groupby_attribute_method into branch/default

When the nodes.VariableRefAttributeAccess and nodes.VariableRefMethodCall were added, the node comparison function were broken since the class instances are not the same. This is a problem when using the groupby and an attribute access or method call on projection variable. For example: Any X, S.download_url() GROUPBY X,S WHERE X is ImportProcess, X shacl_report S

were a bad rql query since S.download_url() is not the same node (not the same class) as S. But actually it is.

This patch allow this syntax

Related to cubicweb#1025 (closed)

Edited by Arnaud Vergnet

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