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
continue;
			}
			if (element.getName().equals(MARKER_FIELD)) {
				processMarkerField(tracker, extension, element);
				continue;
			}
		}
	}
	/**
	 * Create a table of MarkerFields
	 * 
	 * @param tracker
	 * @param extension
	 * @param element
	 */
	private void processMarkerField(IExtensionTracker tracker,
			IExtension extension, IConfigurationElement element) {
		MarkerField field = null;
		try {
			field = (MarkerField) IDEWorkbenchPlugin.createExtension(element,
					ATTRIBUTE_CLASS);
			field.setConfigurationElement(element);
		} catch (CoreException e) {
			MarkerSupportInternalUtilities.handle(e);
		}
		if (field != null)
			fields.put(element
					.getAttribute(MarkerSupportConstants.ATTRIBUTE_ID), field);
		tracker.registerObject(extension, field, IExtensionTracker.REF_STRONG);
	}