Bug 24024 [Viewers] Error in Javadoc for AbstractTreeViewer::setAutoExpandLevel()
from Javadoc for AbstractTreeViewer::setAutoExpandLevel() : * Sets the auto-expand level. * The value 0 means that the root's children are not visible; * 1 means that the root is expanded so that its children are visible, * but the root's grandchildren are not; and so on. That's off by one. 0 means auto-expand is off. 1 means that roots are not expanded. 2 means that children of the roots are expanded, but not grandchildren; etc. * The value <code>EXPAND_ALL</code> means that all subtrees should be * expanded. The constant should read ALL_LEVELS Note that some other expansion-methods need these comment updates too.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
boolean haveDummy = false;
			
			Item[] items= getItems(ti);
			for (int i= 0; i < items.length; i++) {
				if (items[i].getData() != null) {
					disassociate(items[i]);
					items[i].dispose();
				}
				else {
					if (needDummy && !haveDummy) {
						haveDummy = true;
					}
					else {
						items[i].dispose();
					}
				}
			}
			if (needDummy && !haveDummy) {
				newItem(ti, SWT.NULL, -1);
			}
			
			return;
		}
	}
	
	if (elementChildren == null) {
		elementChildren = getSortedChildren(parent);
	}
	
	Control tree = getControl();