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
public void dispose() {
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer,
			 *      java.lang.Object, java.lang.Object)
			 */
			public void inputChanged(Viewer viewer, Object oldInput,
					Object newInput) {
			}
		});
		visibleViewer.setLabelProvider(markerFieldLabelProvider());
		visibleViewer.setInput(this);
		final ListViewer nonVisibleViewer = new ListViewer(columnsComposite,
				SWT.BORDER);
		nonVisibleViewer.setLabelProvider(markerFieldLabelProvider());
		nonVisibleViewer.setContentProvider(new IStructuredContentProvider() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
			 */
			public Object[] getElements(Object inputElement) {
				return hidden.toArray();
			}
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.viewers.IContentProvider#dispose()