Bug 127289 [Markers] SystemFilter and group selection state not preserved
We are not preserving the selection state of the system filters or which group is selected.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerView.java
* @param selection
	 */
	protected void focusSelectionChanged(IWorkbenchPart part,
			ISelection selection) {
		List selectedElements = new ArrayList();
		if (part instanceof IEditorPart) {
			IEditorPart editor = (IEditorPart) part;
			IFile file = ResourceUtil.getFile(editor.getEditorInput());
			if (file == null) {
				IEditorInput editorInput = editor.getEditorInput();
				if (editorInput != null) {
					Object mapping = editorInput
							.getAdapter(ResourceMapping.class);
					if (mapping != null) {
						selectedElements.add(mapping);
					}
				}
			} else {
				selectedElements.add(file);
			}
		} else {
			if (selection instanceof IStructuredSelection) {
				for (Iterator iterator = ((IStructuredSelection) selection)
						.iterator(); iterator.hasNext();) {
					Object object = iterator.next();
					if (object instanceof IAdaptable) {
						ITaskListResourceAdapter taskListResourceAdapter;
						Object adapter = ((IAdaptable) object)
								.getAdapter(ITaskListResourceAdapter.class);
						if (adapter != null