Bug 214137 [Markers] Unbound system filters should be bound to problems view.
In 3.3 we supported systemFilters which are not currently picked up by the problems view. We should pick these up for compatiblity.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/CachedMarkerBuilder.java
return true;
		}
		return building;
	}
	/**
	 * Save the state of the receiver to memento
	 * 
	 * @param memento
	 */
	void saveState(IMemento memento) {
		getComparator().saveState(memento);
		if (categoryGroup == null)
			memento.putString(TAG_CATEGORY_GROUP, VALUE_NONE);
		else
			memento.putString(TAG_CATEGORY_GROUP, getCategoryGroup().getId());
	}
	/**
	 * Schedule an update of the markers with a delay.
	 * 
	 */
	void scheduleMarkerUpdate() {
		cancelJobs();
		currentMap = null;
		building = true;
		progressService.schedule(markerProcessJob, SHORT_DELAY);
	}
	/**
	 * Set whether the filters are being ANDed or ORed.
	 * 
	 * @param and