Description Jan Koehnlein 2010-09-03 06:07:43 EDT

If you call expandNodes() on a TreeViewer with a ILazyTreeContentProvider and a SWT.VIRTUAL Tree that contains virutal nodes, the tree viewer will expand all grandchildren of the nodes to be expanded. This can cause a serious performance/memory penalty, as virtual trees are meant to create their tree items only on demand.

Reason is that internalSetExpand() recursively calls itself when the data on an item is null, which is the case for virtual nodes. Then all grandchildren will be created. 

Workaround for me was to implement my own TreeProvider and move the 
  if (expandedElements.size() > 0) {
    internalSetExpanded(expandedElements, item); 
  }
one line up into the 
  if(date != null) 
block.