Bug 164989 [Viewers] ColumnViewer#getColumnViewerOwner() doesn't respects column count
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
private static final String VIRTUAL_DISPOSE_KEY = Policy.JFACE
			+ ".DISPOSE_LISTENER"; 
	/**
	 * Internal tree viewer implementation.
	 */
	private TreeEditorImpl treeViewerImpl;
	/**
	 * This viewer's control.
	 */
	private Tree tree;
	/**
	 * This viewer's tree editor.
	 */
	private TreeEditor treeEditor;
	/**
	 * Flag for whether the tree has been disposed of.
	 */
	private boolean treeIsDisposed = false;
	private boolean contentProviderIsLazy;
	private boolean contentProviderIsTreeBased;
	/**
	 * Creates a tree viewer on a newly-created tree control under the given
	 * parent. The tree control is created using the SWT style bits
	 * <code>MULTI, H_SCROLL, V_SCROLL,</code> and <code>BORDER</code>. The