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
*/
	private ISubCategoryProvider getProvider(final IConfigurationElement element) {
		final ISubCategoryProvider[] providers = new ISubCategoryProvider[1];
		final CoreException[] exceptions = new CoreException[1];
		Platform.run(new ISafeRunnable() {
			public void run() {
				try {
					providers[0] = (ISubCategoryProvider) IDEWorkbenchPlugin
							.createExtension(element, CLASS);
				} catch (CoreException exception) {
					exceptions[0] = exception;
				}
			}
			/*
			 * (non-Javadoc) Method declared on ISafeRunnable.
			 */
			public void handleException(Throwable e) {
				
			}
		});
		if (exceptions[0] != null) {
			Util.log(exceptions[0]);
			return null;
		}
		return providers[0];
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler#addExtension(org.eclipse.core.runtime.dynamichelpers.IExtensionTracker,