Bug 274262 [History] Allow to never prune history
I20090429-0100. I never want to loose my history and I never want to waste time on shutdown (or start up) to do any history pruning. Please add a preference to disable pruning entirely.
bundles/org.eclipse.ui.ide.application/src/org/eclipse/ui/internal/ide/application/IDEWorkbenchAdvisor.java
private AboutInfo[] welcomePerspectiveInfos = null;
	/**
	 * Helper for managing activites in response to workspace changes.
	 */
	private IDEWorkbenchActivityHelper activityHelper = null;
	/**
	 * Helper for managing work that is performed when the system is otherwise
	 * idle.
	 */
	private IDEIdleHelper idleHelper;
	private Listener settingsChangeListener;
	
	/**
	 * Support class for monitoring workspace changes and periodically
	 * validating the undo history
	 */
	private WorkspaceUndoMonitor workspaceUndoMonitor;
	/**
	 * The IDE workbench error handler.
	 */
	private AbstractStatusHandler ideWorkbenchErrorHandler;
	/**
	 * Creates a new workbench advisor instance.
	 */
	public IDEWorkbenchAdvisor() {
		super();
		if (workbenchAdvisor != null) {
			throw new IllegalStateException();
		}
		workbenchAdvisor = this;