Bug 27408 Preference convertor also maps to font registry
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/JavaPlugin.java
/**
	 * The id of the best match hover contributed for extension point
	 * <code>javaEditorTextHovers</code>.
	 *
	 * @since 2.1
	 */
	public static String ID_BESTMATCH_HOVER= "org.eclipse.jdt.ui.BestMatchHover"; 
	/**
	 * The id of the source code hover contributed for extension point
	 * <code>javaEditorTextHovers</code>.
	 *
	 * @since 2.1
	 */
	public static String ID_SOURCE_HOVER= "org.eclipse.jdt.ui.JavaSourceHover"; 
	/**
	 * The id of the javadoc hover contributed for extension point
	 * <code>javaEditorTextHovers</code>.
	 *
	 * @since 2.1
	 */
	public static String ID_JAVADOC_HOVER= "org.eclipse.jdt.ui.JavadocHover"; 
	/**
	 * The id of the problem hover contributed for extension point
	 * <code>javaEditorTextHovers</code>.
	 *
	 * @since 2.1
	 */
	public static String ID_PROBLEM_HOVER= "org.eclipse.jdt.ui.ProblemHover";