[Dune] Flyspray task #109 - father() chasing does not work

[dune at hal.iwr.uni-heidelberg.de]

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Notice from Dune 

A new Flyspray task has been opened in this category - "Alberta"
You are receiving this because you are listed as the category owner.

Task summary: father() chasing does not work 

You can find more information about this bug at the Flyspray page:
http://hal.iwr.uni-heidelberg.de/flyspray/index.php?do=details&id=109