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/JavaEditor.java
/*
	 * @see AbstractTextEditor#createSourceViewer(Composite, IVerticalRuler, int)
	 */
	protected ISourceViewer createJavaSourceViewer(Composite parent, IVerticalRuler verticalRuler, IOverviewRuler overviewRuler, boolean isOverviewRulerVisible, int styles, IPreferenceStore store) {
		return new JavaSourceViewer(parent, verticalRuler, getOverviewRuler(), isOverviewRulerVisible(), styles, store);
	}
	
	/*
	 * @see AbstractTextEditor#affectsTextPresentation(PropertyChangeEvent)
	 */
	protected boolean affectsTextPresentation(PropertyChangeEvent event) {
		return ((JavaSourceViewerConfiguration)getSourceViewerConfiguration()).affectsTextPresentation(event) || super.affectsTextPresentation(event);
	}
		
	/**
	 * Creates and returns the preference store for this Java editor with the given input.
	 *
	 * @param input The editor input for which to create the preference store
	 * @return the preference store for this editor
	 *
	 * @since 3.0
	 */
	private IPreferenceStore createCombinedPreferenceStore(IEditorInput input) {
		List stores= new ArrayList(3);
		IJavaProject project= EditorUtility.getJavaProject(input);
		if (project != null)
			stores.add(new OptionsAdapter(project.getOptions(false), JavaPlugin.getDefault().getMockupPreferenceStore(), new OptionsAdapter.IPropertyChangeEventFilter() {
				public boolean isFiltered(PropertyChangeEvent event) {
					IJavaElement inputJavaElement= getInputJavaElement();
					IJavaProject javaProject= inputJavaElement != null ? inputJavaElement.getJavaProject() : null;