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
.getProjectsAsCollection(focusResources);
				Collection newProjects = MarkerFieldFilterGroup
						.getProjectsAsCollection(newElements);
				if (oldProjects.size() == newProjects.size()
						&& newProjects.containsAll(oldProjects))
					continue;
				return true;
			}
			return true;
		}
		return false;
	}
	/**
	 * Write the settings for the filters to the memento.
	 * 
	 * @param memento
	 */
	private void writeFiltersSettings(XMLMemento memento) {
		memento.putBoolean(TAG_AND, andFilters);
		Iterator groups = getAllFilters().iterator();
		while (groups.hasNext()) {
			MarkerFieldFilterGroup group = (MarkerFieldFilterGroup) groups
					.next();
			IMemento child = memento
					.createChild(TAG_GROUP_ENTRY, group.getID());
			group.saveFilterSettings(child);
		}
	}
}