The thumb and arrows of the thread pane scrollbar can be dragged like images, which prevents the thumb from being dragged to set ones place in the content.
reassigning to hyatt. I'm seeing this too on Windows.
This is not my bug. Reassigning to putterman. YOu need to fix your drag and drop handlers to ignore the scrollbar. The old tree widget improperly hid the scrollbar events from your handlers. The new one does not.
The fix for this in the browser was a simple JS change
reassigning to chuang. Candice, could you take a look at this?
duplicate... *** This bug has been marked as a duplicate of 43134 ***