#368 Children tasks not under mother task

[Jean-Marc Libs]

If someone gives a dependency to a mother task (I do
not believe that doing so makes sense, but it is possible),
the mother task moves to comply with the dependency
instead of staying on top of it's children tasks.

Then the children tasks can be outside the mother task.

Additionally, it is necessary to do "refresh" sometimes
to see the effect of creating a dependence with a
mother task.

[Dmitry Barashev]

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Duplicates:

http://sourceforge.net/tracker/index.php?func=detail&aid=1315241&group_id=72728&atid=535427
http://sourceforge.net/tracker/index.php?func=detail&aid=1102023&group_id=72728&atid=535427