void UpdateSyntaxHighlighting(FileName fileName)
{
var oldHighlighter = primaryTextEditor.GetService <IHighlighter>();
var highlighting = HighlightingManager.Instance.GetDefinitionByExtension(Path.GetExtension(fileName));
var highlighter = SD.EditorControlService.CreateHighlighter(document);
primaryTextEditor.SyntaxHighlighting = highlighting;
primaryTextEditor.TextArea.TextView.LineTransformers.RemoveAll(t => t is HighlightingColorizer);
primaryTextEditor.TextArea.TextView.LineTransformers.Insert(0, new HighlightingColorizer(highlighter));
primaryTextEditor.UpdateCustomizedHighlighting();
// Dispose the old highlighter; necessary to avoid memory leaks as
// semantic highlighters might attach to global parser events.
if (oldHighlighter != null)
{
oldHighlighter.Dispose();
}
}