Bug 110998 [Problems] Remove the working set selection and switch to using global working sets
M2 We need to remove the working sets option in the filter and switch to using the current list of working sets. We should move this to a preference that says only "Use Working Sets"
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerSupportRegistry.java
* @return ISubCategoryProvider[] or <code>null</code>
	 */
	public ISubCategoryProvider[] getSubCategoryProviders(String markerType) {
		Object providers;
		providers = registeredProviders.get(markerType);
		if (providers == null)
			return null;
		Collection providerCollection = (Collection) providers;
		ISubCategoryProvider[] providerArray = new ISubCategoryProvider[providerCollection
				.size()];
		providerCollection.toArray(providerArray);
		return providerArray;
	}
	/**
	 * Get the category associated with marker. Return <code>null</code> if
	 * there are none.
	 * 
	 * @param marker
	 * @return String or <code>null</code>
	 */
	public String getCategory(IMarker marker) {
		try {
			return getCategory(marker.getType());
		} catch (CoreException e) {
			Util.log(e);
		}
		return null;
	}
	/**
	 * Get the category associated with markerType. Return <code>null</code>