graphmod: correctly emit nodes with more than 2 predecessors The grandparent() function was returning only the closest predecessor of a missing parent while it must return all of them to display a correct ancestry graph.

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  $ echo '[Section]' >> $HGRCPATH

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  $ echo 'KeY = Case Sensitive' >> $HGRCPATH

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  $ echo 'key = lower case' >> $HGRCPATH

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  $ hg showconfig Section

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  Section.KeY=Case Sensitive

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  Section.key=lower case

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