internal CompoundAction(ISource src, string description)
{
this.opened = false;
this.src = src;
this.action = (IVsCompoundAction)src.GetTextLines();
if (this.action == null)
{
throw new ArgumentNullException("(IVsCompoundAction)src.GetTextLines()");
}
NativeMethods.ThrowOnFailure(action.OpenCompoundAction(description));
this.opened = true;
this.colorizer = src.GetColorizer();
if (colorizer != null) colorizer.Suspend(); // batch colorization
}