Bug 28638 [Preferences] Import Preferences: Crashes on eclipse
bundles/org.eclipse.jface/src/org/eclipse/jface/resource/FontRegistry.java
* @param update - fire a font mapping changed if true. False
	 * 	if this method is called from the get method as no setting
	 *  has changed.
	 */
	public void put(String symbolicName, FontData[] fontData) {
		put(symbolicName, fontData, true);
	}
	/**
	 * Adds (or replaces) a font to this font registry under the given
	 * symbolic name.
	 * <p>
	 * A property change event is reported whenever the mapping from
	 * a symbolic name to a font changes. The source of the event is
	 * this registry; the property name is the symbolic font name.
	 * </p>
	 *
	 * @param symbolicName the symbolic font name
	 * @param fontData an Array of FontData
	 * @param update - fire a font mapping changed if true. False
	 * 	if this method is called from the get method as no setting
	 *  has changed.
	 */
	private void put(
		String symbolicName,
		FontData[] fontData,
		boolean update) {
		Assert.isNotNull(symbolicName);
		Assert.isNotNull(fontData);
		FontData[] existing = (FontData[]) stringToFontData.get(symbolicName);
		if (Arrays.equals(existing, fontData))