Description Craig Salter 2001-11-10 22:42:07 EST

I'm using a TreeViewer and I've noticed that the expansion state doen't seem to 
be preserved correctly when model objects are inserted or removed.  

If I have the following tree, where A,B, and D are expanded.

[-] A
     [-] B
     [+] C
     [-] D

Then I add an X object into my model before B ... which triggers a 
viewer.refresh().  Now A, X and C are expanded.  

[-] A
     [-] X
     [+] B
     [-] C
     [+] D

There appears to be a bug in the AbstractTreeViewer code (likely in the  
updateChildren() method) such that the item.getData() information is not being 
respected when attempting to preserve expansion state.  The result (as shown 
above) is that the expansion state is associated with the wrong tree items.