Bug 213474 [Markers] Unchecking filter does not update
I20071218-0800. 1. Show > TODO ==> filter is applied 2. Show > TODO ==> nothing happens, old filter stays but view menu looks like this: [ ] TODO ---- [x] Show All
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/CachedMarkerBuilder.java
return visibleFields;
	}
	/**
	 * Return whether or not the receiver has markers without scheduling
	 * anything if it doesn't.
	 * 
	 * @return boolean <code>true</code> if the markers have not been
	 *         calculated.
	 */
	boolean hasNoMarkers() {
		return currentMap == null;
	}
	/**
	 * Return whether or not the receiver is building.
	 * 
	 * @return boolean
	 */
	boolean isBuilding() {
		return building;
	}
	/**
	 * Return whether or not we are showing a hierarchy,.
	 * 
	 * @return <code>true</code> if a hierarchy is being shown.
	 */
	boolean isShowingHierarchy() {
		return categoryGroup != null;
	}
	/**
	 * Load the filters preference.