Created attachment 601651 [details]
tree view dead loop

Filed from caserun (INSERT URL HERE)
https://tcms-stage.englab.bne.redhat.com/plan/6853/copy-of-gedit-rhel6#treeview

Version-Release number of selected component (if applicable):
3.8.0-2 on stage

Steps to Reproduce: 
have entered into a plan.


1.Click the "Tree View" label.
2.Click "Chang parent node for plan XX" label.
3.Input a the child id as parent id.
4.Click "Ok" button.
5.Click "Submit" button.



Actual results: 
The child is added as parent, and click up several times, it shows as a dead loop.

Expected results:
The system will warn the user that it is a child node, and could not be the parent. when adding the parent, and even if they could be parent for each other, the tree view should not be a dead loop.