void OnToolTipRequest(object sender, ToolTipRequestEventArgs e)
		{
			if (e.ToolTipShown)
				return;
			Point mousepos = e.MousePosition;
			FoldMarker marker = textArea.TextView.GetFoldMarkerFromPosition(mousepos.X - textArea.TextView.DrawingPosition.X,
			                                                                mousepos.Y - textArea.TextView.DrawingPosition.Y);
			if (marker != null && marker.IsFolded) {
				StringBuilder sb = new StringBuilder(marker.InnerText);
				
				// max 10 lines
				int endLines = 0;
				for (int i = 0; i < sb.Length; ++i) {
					if (sb[i] == '\n') {
						++endLines;
						if (endLines >= 10) {
							sb.Remove(i + 1, sb.Length - i - 1);
							sb.Append(Environment.NewLine);
							sb.Append("...");
							break;
							
						}
					}
				}
				sb.Replace("\t", "    ");
				e.ShowToolTip(sb.ToString());
				return;
			}
			
			List<TextMarker> markers = textArea.Document.MarkerStrategy.GetMarkers(e.LogicalPosition);
			foreach (TextMarker tm in markers) {
				if (tm.ToolTip != null) {
					e.ShowToolTip(tm.ToolTip.Replace("\t", "    "));
					return;
				}
			}
		}