Bug 241208 [Markers] [Problems View] Restore Defaults is not working in the preferences
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkerPreferencesDialog.java
.getControl(), IDialogConstants.BUTTON_MARGIN);
		toVisibleButtonData.right = new FormAttachment(nonVisibleViewer
				.getControl(), rightMargin);
		toVisibleButton.setLayoutData(toVisibleButtonData);
		toVisibleButton.addSelectionListener(new SelectionAdapter() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent)
			 */
			public void widgetSelected(SelectionEvent e) {
				List selection = ((IStructuredSelection) nonVisibleViewer
						.getSelection()).toList();
				hidden.removeAll(selection);
				visible.addAll(selection);
				visibleViewer.refresh();
				nonVisibleViewer.refresh();
			}
		});
	}
	/**
	 * Return a label provider for fields.
	 * @return LabelProvider
	 */
	private LabelProvider markerFieldLabelProvider() {
		return new LabelProvider() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.viewers.LabelProvider#getText(java.lang.Object)