Bug 17699 Java Editor: Local Histroy menu entries are enabled for read-only files
F1 - make file read-only - open it - observe: context menu contains Local History actions. Only compare makes sense for read-only files
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/compare/JavaReplaceWithEditionAction.java
String errorTitle= CompareMessages.getString("ReplaceFromHistory.title"); 
		String errorMessage= CompareMessages.getString("ReplaceFromHistory.internalErrorMessage"); 
		
		Shell shell= JavaPlugin.getActiveWorkbenchShell();
		
		
		ISelection selection= getSelection();
		IMember input= getEditionElement(selection);
		if (input == null) {
			
			MessageDialog.openError(shell, errorTitle, errorMessage);
			return;
		}
		
		IFile file= getFile(input);
		if (file == null) {
			MessageDialog.openError(shell, errorTitle, errorMessage);
			return;
		}
										
		boolean inEditor= beingEdited(file);
		if (inEditor)
			input= (IMember) getWorkingCopy(input);
		
		TextBuffer buffer= null;
		try {
			buffer= TextBuffer.acquire(file);
			ResourceBundle bundle= ResourceBundle.getBundle(BUNDLE_NAME);
			EditionSelectionDialog d= new EditionSelectionDialog(shell, bundle);