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
getDocumentProvider().saveDocument(progressMonitor, newInput, getDocumentProvider().getDocument(getEditorInput()), true);
			success= true;
			
		} catch (CoreException x) {
			IStatus status= x.getStatus();
			if (status == null || status.getSeverity() != IStatus.CANCEL)
				ErrorDialog.openError(shell, JavaEditorMessages.getString("CompilationUnitEditor.error.saving.title2"), JavaEditorMessages.getString("CompilationUnitEditor.error.saving.message2"), x.getStatus()); 
		} finally {
			provider.changed(newInput);
			if (success)
				setInput(newInput);
		}
		
		if (progressMonitor != null)
			progressMonitor.setCanceled(!success);
	}
	
	/*
	 * @see AbstractTextEditor#doSetInput(IEditorInput)
	 */
	protected void doSetInput(IEditorInput input) throws CoreException {
		super.doSetInput(input);
		configureTabConverter();
		configureToggleCommentAction();
	}
	/*
	 * @see org.eclipse.jdt.internal.ui.javaeditor.JavaEditor#installOverrideIndicator(boolean)
	 * @since 3.0
	 */
	protected void installOverrideIndicator(boolean provideAST) {