Bug 158778 [Viewers] request for remove(parent, index) API on tree viewer
3.3 It would be helpful to have a 'remove(Object parent, int index)' method on the tree viewer to complement that 'replace(...)' and 'setChildCount(...)' APIs. The debug platform requires such a method to implement filtering in virtual tree views. Rather than performing a 'replace/remove' based on elements, the content provider can make one atomic call to remove an element at a specific index.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
* Sets the cell editors of this tree viewer.
	 * 
	 * @param editors
	 *            the list of cell editors
	 * @since 3.1
	 */
	public void setCellEditors(CellEditor[] editors) {
		treeViewerImpl.setCellEditors(editors);
	}
	/**
	 * Sets the cell modifier of this tree viewer.
	 * 
	 * @param modifier
	 *            the cell modifier
	 * @since 3.1
	 */
	public void setCellModifier(ICellModifier modifier) {
		treeViewerImpl.setCellModifier(modifier);
	}
	/**
	 * Sets the column properties of this tree viewer. The properties must
	 * correspond with the columns of the tree control. They are used to
	 * identify the column in a cell modifier.
	 * 
	 * @param columnProperties
	 *            the list of column properties
	 * @since 3.1
	 */
	public void setColumnProperties(String[] columnProperties) {
		treeViewerImpl.setColumnProperties(columnProperties);