Bug 294303 [Markers] 'Queuing Viewer Updates' in Problems view
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/ExtendedMarkersView.java
* Return whether or not generator is the selected one.
	 * 
	 * @param generator
	 * @return boolean
	 */
	boolean isShowing(MarkerContentGenerator generator) {
		return generator != null ? generator.equals(generator) : false;
	}
	/**
	 * Set the generator for the view.
	 * 
	 * @param generator
	 */
	void internalSetGenerator(MarkerContentGenerator generator) {
		this.generator=generator;
	}
	/**
	 * @return Returns the generator.
	 */
	MarkerContentGenerator getGenerator() {
		return generator;
	}
	/**
	 * Log that a generator id is invalid.
	 * 
	 * @param id
	 */
	void logInvalidGenerator(String id) {
		StatusManager.getManager().handle(
				new Status(IStatus.WARNING, IDEWorkbenchPlugin.IDE_WORKBENCH,