Bug 214648 [Markers] AttributeMarkerGroupings and GroupingEntries not being cleaned up on removal
We are still leaving the references to AttributeMarkerGroupings and GroupingEntries when we unload
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerSupportRegistry.java
if (next.isFilteredOutByActivity()) {
				continue;
			}
			filteredFilters.add(next);
		}
		return filteredFilters;
	}
	/**
	 * Get the constant for scope from element. Return -1 if there is no value.
	 * 
	 * @param element
	 * @return int one of MarkerView#ON_ANY MarkerView#ON_SELECTED_ONLY
	 *         MarkerView#ON_SELECTED_AND_CHILDREN
	 *         MarkerView#ON_ANY_IN_SAME_CONTAINER
	 */
	private int getScopeValue(IConfigurationElement element) {
		String scope = element.getAttribute(SCOPE);
		if (scope == null) {
			return -1;
		}
		if (scope.equals(ON_ANY)) {
			return MarkerFilter.ON_ANY;
		}
		if (scope.equals(ON_SELECTED_ONLY)) {
			return MarkerFilter.ON_SELECTED_ONLY;
		}
		if (scope.equals(ON_SELECTED_AND_CHILDREN)) {
			return MarkerFilter.ON_SELECTED_AND_CHILDREN;
		}
		if (scope.equals(ON_ANY_IN_SAME_CONTAINER)) {