Bug 163241 [Undo] Allow Undo notification to be turned off
When deleting a project you will always been notified that it removes the Undo History. Could we add a "Don't show this" checkbox to its dialog settings? Thanx, PW
bundles/org.eclipse.ui.ide/extensions/org/eclipse/ui/actions/DeleteResourceAction.java
* @param shell
	 *            the shell for any dialogs
	 */
	public DeleteResourceAction(Shell shell) {
		super(IDEWorkbenchMessages.DeleteResourceAction_text);
		setToolTipText(IDEWorkbenchMessages.DeleteResourceAction_toolTip);
		PlatformUI.getWorkbench().getHelpSystem().setHelp(this,
				IIDEHelpContextIds.DELETE_RESOURCE_ACTION);
		setId(ID);
		if (shell == null) {
			throw new IllegalArgumentException();
		}
		this.shell = shell;
	}
	/**
	 * Returns whether delete can be performed on the current selection.
	 * 
	 * @param resources
	 *            the selected resources
	 * @return <code>true</code> if the resources can be deleted, and
	 *         <code>false</code> if the selection contains non-resources or
	 *         phantom resources
	 */
	private boolean canDelete(IResource[] resources) {
		
		
		if (!(containsOnlyProjects(resources) || containsOnlyNonProjects(resources))) {
			return false;
		}
		if (resources.length == 0) {