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
}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler#removeExtension(org.eclipse.core.runtime.IExtension,
	 *      java.lang.Object[])
	 */
	public void removeExtension(IExtension extension, Object[] objects) {
		Collection removedGroups = new ArrayList();
		for (int i = 0; i < objects.length; i++) {
			if (objects[i] instanceof ProblemFilter) {
				registeredFilters.remove(objects[i]);
				continue;
			}
			if (objects[i] instanceof MarkerGroup) {
				markerGroups.remove(((MarkerGroup) objects[i]).getId());
				removedGroups.add(objects[i]);
				continue;
			}
			if (objects[i] instanceof MarkerGroupingEntry) {
				MarkerGroupingEntry entry = (MarkerGroupingEntry) objects[i];
				entry.getMarkerGroup().remove(entry);
				markerGroupingEntries.remove(entry.getId());
				continue;
			}
			if (objects[i] instanceof String) {
				removeValues(objects[i], categories);
				continue;
			}
			if (objects[i] instanceof MarkerField) {