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) {
			}
		});
		nonVisibleViewer.setInput(this);
		FormData nonVisibleViewerData = new FormData();
		nonVisibleViewerData.right = new FormAttachment(nonVisibleLabel, 0,
				SWT.RIGHT);
		nonVisibleViewerData.left = new FormAttachment(nonVisibleLabel, 0,
				SWT.LEFT);
		nonVisibleViewerData.top = new FormAttachment(nonVisibleLabel,
				IDialogConstants.BUTTON_MARGIN);
		nonVisibleViewerData.bottom = new FormAttachment(100, rightMargin);
		nonVisibleViewerData.height = convertHeightInCharsToPixels(15);
		nonVisibleViewerData.width = convertWidthInCharsToPixels(25);
		nonVisibleViewer.getControl().setLayoutData(nonVisibleViewerData);
		Button toNonVisibleButton = new Button(columnsComposite, SWT.PUSH);
		toNonVisibleButton
				.setText(getDefaultOrientation() == SWT.RIGHT_TO_LEFT ? MarkerMessages.MarkerPreferences_MoveLeft
						: MarkerMessages.MarkerPreferences_MoveRight);
		FormData toNonVisibleButtonData = new FormData();