Why are line numbers not scrolled along with text view?

[Denis535]

I'm trying to record a scrolling animation of my window:

private static void TakeSnapshot(BitmapEncoder encoder, IWpfTextView view) {
    ThreadHelper.ThrowIfNotOnUIThread();
    var element = GetRoot( view.VisualElement );
    {
        view.ViewportLeft = 0;
        view.DisplayTextLineContainingBufferPosition( new SnapshotPoint( view.TextSnapshot, 0 ), 0, ViewRelativePosition.Top );
        view.Caret.MoveTo( new SnapshotPoint( view.TextSnapshot, 0 ), PositionAffinity.Predecessor );
        element.UpdateLayout();
        TakeSnapshot2( encoder, element );
    }
    while (view.TextViewLines.LastVisibleLine.End.Position < view.TextSnapshot.Length) {
        view.ViewScroller.ScrollViewportVerticallyByPixels( -100 );
        element.UpdateLayout();
        TakeSnapshot2( encoder, element );
    }
}
private static void TakeSnapshot2(BitmapEncoder encoder, FrameworkElement element) {
    var renderTargetBitmap = new RenderTargetBitmap( (int) element.ActualWidth, (int) element.ActualHeight, 96, 96, PixelFormats.Pbgra32 );
    renderTargetBitmap.Render( element );
    encoder.Frames.Add( BitmapFrame.Create( renderTargetBitmap ) );
}

But there is a problem: the line numbers are not updated.
So I want to ask, how to fix it?

[Denis535]

microsoft/VSExtensibility#445 (comment)