Bug 156537 [Viewers] Virtual tree viewer does not populate with initial children
I20060830-1650 When a tree viewer is created with the SWT.Vitrual flag and uses an ILazyTreeContentProvider, the viewew does not populate with the initial children in the model. The method TreeViewer.createChildren(Widget) only updates existing items if the parent (root)element has been mapped to data, and does not query the content provider for the number of children it has. Attached is a sample plug-in showing the problem. The tree "model" looks like this: root one two three When the input is set to the viewer ("root") a call is made to "createChildren", but the content provider is never used.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
}
		}
	}
	public boolean isExpandable(Object element) {
		if (getContentProvider() instanceof ILazyTreeContentProvider) {
			TreeItem treeItem = (TreeItem) internalExpand(element, false);
			if (treeItem == null) {
				return false;
			}
			virtualMaterializeItem(treeItem);
			return treeItem.getItemCount() > 0;
		}
		return super.isExpandable(element);
	}
	protected Object getParentElement(Object element) {
		if (!(element instanceof TreePath)
				&& (getContentProvider() instanceof ILazyTreeContentProvider)) {
			ILazyTreeContentProvider lazyTreeContentProvider = (ILazyTreeContentProvider) getContentProvider();
			return lazyTreeContentProvider.getParent(element);
		}
		return super.getParentElement(element);
	}
	protected void createChildren(Widget widget) {
		if (getContentProvider() instanceof ILazyTreeContentProvider) {
			final Item[] tis = getChildren(widget);
			if (tis != null && tis.length > 0) {
				
				for (int i = 0; i < tis.length; i++) {
					tis[i].getText();
				}