Bug 213040 [Markers] Selected filters not being kept on restart
When I select "Warnings on Selection" and then restart it is not selected when I come back in. We need to retain these selections. Note this is only a problem when selecting from the menu - from the dialog works fine.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/MarkerContentGenerator.java
*/
	MarkerField[] getAllFields() {
		return allFields;
	}
	/**
	 * Return all of the filters for the receiver.
	 * 
	 * @return Collection of MarkerFieldFilterGroup
	 */
	Collection getAllFilters() {
		if (filters == null) {
			filters = new ArrayList();
			IConfigurationElement[] filterReferences = configurationElement
					.getChildren(ELEMENT_MARKER_FIELD_FILTER_GROUP);
			for (int i = 0; i < filterReferences.length; i++) {
				filters.add(new MarkerFieldFilterGroup(filterReferences[i],
						this));
			}
			
			loadFiltersPreference();
		}
		return filters;
	}
	/**
	 * Return the group used to generate categories.
	 * 
	 * @return MarkerGroup or <code>null</code>.
	 */
	MarkerGroup getCategoryGroup() {
		return categoryGroup;