[df] Integrate Report action with systematic variations #17396
+86
−58
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This commit introduces the behaviour of the Report action in case systematic variations were requested, i.e. it is now possible to call VariationsFor(report). In order to create a different report per variation, the proper branch of the computation graph with the filters of the "varied universe" must be retrieved. This requires knowing which is the variation being requested when cloning the ReportHelper instance. To this end, the signature of the MakeNew protocol used by the action helpers is extended to optionally take the name of the variation being requested. When creating the varied helpers, the action also passes the name of the variation. A test for this new functionality has been added.
Fixes #10551