public ShaderlabCompletionCommandHandlder(IVsTextView textViewAdapter, ITextView textView, ShaderlabCompletionHandlerPrvider handlerProvider)
        {
            this.textView = textView;
            this.completionHandlerProvider = handlerProvider;

            textViewAdapter.AddCommandFilter(this, out nextCommandHandler);
        }
        public ShaderlabCompletionCommandHandlder(IVsTextView textViewAdapter, ITextView textView, ShaderlabCompletionHandlerPrvider handlerProvider)
        {
            this.textView = textView;
            this.completionHandlerProvider = handlerProvider;

            textViewAdapter.AddCommandFilter(this, out nextCommandHandler);
        }