Bug 292322 [Viewers] Tree view is removing + indicator when one of multiple children is removed.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
if (contentProviderIsLazy) {
			
			getControl().update();
		}
	}
	/*
	 * (non-Javadoc) Method declared in AbstractTreeViewer.
	 */
	protected void setSelection(List items) {
		Item[] current = getSelection(getTree());
		
		if (isSameSelection(items, current)) {
			return;
		}
		TreeItem[] newItems = new TreeItem[items.size()];
		items.toArray(newItems);
		getTree().setSelection(newItems);
	}
	/*
	 * (non-Javadoc) Method declared in AbstractTreeViewer.
	 */
	protected void showItem(Item item) {
		getTree().showItem((TreeItem) item);
	}
	/*
	 * (non-Javadoc)
	 *
	 * @see org.eclipse.jface.viewers.AbstractTreeViewer#getChild(org.eclipse.swt.widgets.Widget,
	 *      int)
	 */