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/AttributeMarkerGrouping.java
/**
	 * Return the id of the default grouping.
	 * @return String or <code>null</code> if it is not defined.
	 */
	public String getDefaultGroupingEntry() {
		return defaultGroupingEntry;
	}
	/**
	 * Return the id of the marker type for this type.
	 * @return String
	 */
	public String getMarkerType() {
		return markerType;
	}
	/**
	 * Return the name of the attribute for the receiver.
	 * @return String
	 */
	public String getAttribute() {
		return attribute;
	}
	/**
	 * Return the IConfigurationElement for the receiver.
	 * @return IConfigurationElement
	 */
	public IConfigurationElement getElement() {
		return element;
	}
}