[Laszlo-user] Drag and drop refresh issue using dhtml

[Charles Watt]

After running into issues with the opttree component from the incubator, 
I've extended the standard tree component to support drag and drop to 
allow reordering of the tree.  I used the draglib library with 
checkdragstate and basedragimage for the implementation. 

It works great in all versions of swf.  But with dhtml there is a subtle 
bug -- and of course dhtml is technology in which we need to deliver the 
code.  With dhtml, if tree items are moved to a different branch of the 
tree, subsequent operations can be flakey.  The correct item will be 
dragged, but occasionally the wrong target will be selected for the 
drop.  After some investigation it looks as if the tracker implementing 
the drop does not refresh its view of the tree layout.  When it tries to 
drop onto the Nth clone, it selects the original Nth clone rather than 
the current.  However the displayed tree looks correct and I've manually 
walked both the hierarchy of clones and nodes and they both look 
correct.  Only the tracker seems confused.

I tried fixing this by unregistering all drop targets and then 
re-registering them after moving a tree item.  But the tracker still has 
the same, original view of the tree. 

Any suggestions on what I missed or how I might get the tracker synched 
up with the current layout of the tree?

Thanks!
Charlie Watt
Racemi