logic allows circular references

[mlueft]

Hi!

Thanks for this great tool. I am using it in my project and it saved me some time. While building and testing my frontend for editing I have seen the logic allows to make a node a child of itself or of one of it's children.

A fix is simple:

$newParent->getLeftValue() > $movedChild->getLeftValue()
&& $newParent->getRightValue() < $movedChild->getRightValue()

If this contition is true don't move the node.

regards,

michael