#728 moved tasks in wrong order

[Schmitt]

If I open an new project and open 6 tasks. Then I take Task 2-5 and move them right (->) and then I take the tasks 3-5 and move them left (<-) the tasks were in wrong order (5,4,3).

That´s every time I move tasks to the higher level (left).

Please correct that ugly bug.

Thanks.

[Dmitry Barashev]

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duplicates:
https://sourceforge.net/tracker/index.php?func=detail&aid=1449913&group_id=72728&atid=535427