Bug 66923 [typing]Can delete word (Ctrl-Backspace) on read only file
When you open read-only java file, all editing functions are disabled except deleting with Ctrl-Backspace and Ctrl-Del, then it is imposible to save this file. On simple text file it works ok - it blocks all edditing functions (including Ctrl-Backspace). I am using build 200406111814
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
private RememberedSelection fRememberedSelection= new RememberedSelection();
	
	private BracketInserter fBracketInserter= new BracketInserter();
	
	private GenerateActionGroup fGenerateActionGroup;
	private CompositeActionGroup fContextMenuGroup;
	
	/**
	 * Reconciling listeners.
	 * @since 3.0
	 */
	private ListenerList fReconcilingListeners= new ListenerList();
	/**
	 * Mutex for the reconciler. See https://bugs.eclipse.org/bugs/show_bug.cgi?id=63898
	 * for a description of the problem.
	 * <p>
	 * TODO remove once the underlying problem is solved.
	 * </p>
	 */
	private final Object fReconcilerLock= new Object();
	
	
	/**
	 * Creates a new compilation unit editor.
	 */
	public CompilationUnitEditor() {
		super();
		setDocumentProvider(JavaPlugin.getDefault().getCompilationUnitDocumentProvider());
		setEditorContextMenuId("#CompilationUnitEditorContext"); 
		setRulerContextMenuId("#CompilationUnitRulerContext");