Bug 172814 [Viewers] Rename AbstractViewerEditor to ColumnViewerEditor
There is no "AbstractViewer", and this class is referenced from ColumnViewer. To make the names more consistent, it should be called ColumnViewerEditor, not AbstractViewerEditor.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
* @param currentChildCount
	 */
	private void virtualLazyUpdateHasChildren(Item item, int currentChildCount) {
		if (contentProviderIsTreeBased) {
			TreePath treePath;
			treePath = getTreePathFromItem(item);
			if (currentChildCount == 0) {
				
				((ILazyTreePathContentProvider) getContentProvider())
						.updateHasChildren(treePath);
			} else {
				((ILazyTreePathContentProvider) getContentProvider())
						.updateChildCount(treePath, currentChildCount);
			}
		} else {
			((ILazyTreeContentProvider) getContentProvider()).updateChildCount(item.getData(), currentChildCount);
		}
	}
	protected void disassociate(Item item) {
		if (contentProviderIsLazy) {
			
			item.setText(" "); 
		}
		super.disassociate(item);
	}
	protected int doGetColumnCount() {
		return tree.getColumnCount();
	}
}