string Highlight (string str, ChunkStyle style)
{
var color = (Gdk.Color)((HslColor)colorStyle.GetForeground (style));
if (grayOut) {
color = AlphaBlend (color, (Gdk.Color)((HslColor)colorStyle.PlainText.Background), optionalAlpha);
}
var colorString = MonoDevelop.Components.HelperMethods.GetColorString (color);
return "<span foreground=\"" + colorString + "\">" + str + "</span>";
}