Bug 125874 [create script] 'Select All' doesn't work
20060131 - Create script - Press 'Select All', nothing happens
org.eclipse.ltk.ui.refactoring/src/org/eclipse/ltk/internal/ui/refactoring/history/RefactoringHistoryControl.java
if (fControlConfiguration.isCheckableViewer())
			return new RefactoringHistoryTreeViewer(parent, SWT.H_SCROLL | SWT.V_SCROLL);
		else
			return new TreeViewer(parent, SWT.H_SCROLL | SWT.V_SCROLL);
	}
	/**
	 * {@inheritDoc}
	 */
	public final void dispose() {
		RefactoringCore.getRefactoringHistoryService().disconnect();
		super.dispose();
	}
	/**
	 * Computes the checked refactoring descriptor proxies of the specified
	 * element.
	 * 
	 * @param viewer
	 *            the refactoring history viewer
	 * @param set
	 *            the set of checked refactoring descriptors
	 * @param element
	 *            the element to compute the descriptors for
	 */
	private void getCheckedDescriptorProxies(final TreeViewer viewer, final Set set, final Object element) {
		if (element instanceof RefactoringHistoryEntry) {
			if (viewer instanceof RefactoringHistoryTreeViewer) {
				final RefactoringHistoryTreeViewer extended= (RefactoringHistoryTreeViewer) viewer;
				if (!extended.getChecked(element))
					return;
			}