Bug 214492 [Markers] Need to be able to add filters to existing markers views
Currently you can only add filters to a new markerContentProvider. We need to able to bind them to existing markerContentProviders as well.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerSupportRegistry.java
} else {
					selectedTypes.add(type);
				}
			}
		}
		if (selectedTypes.size() > 0) {
			
			filter.setSelectedTypes(selectedTypes);
		}
		return filter;
	}
	/*
	 * (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) {