Fix the long-range correction
Description
Fix the long-range correction.
This feature got broken with some refactoring. A message is added for the non-supported cases. A test is added to prevent future regression.
Closes #997
News snippet
Fix the long-range correction.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.
Edited by Nicolas Tancogne-Dejean