internal async void UpdateParameterInfoLocation()
        {
            var isCompletionWindowVisible = (CompletionWindowManager.Wnd?.Visible ?? false);
            var ctx = Widget?.CurrentCodeCompletionContext;

            if (ctx == null)
            {
                return;
            }
            var lineHeight = (int)Ext.Editor.LineHeight;
            var geometry   = Xwt.MessageDialog.RootWindow.Screen.VisibleBounds;
            var cmg        = ParameterInformationWindowManager.CurrentMethodGroup;

            int cparam = Ext != null ? await Ext.GetCurrentParameterIndex(cmg.MethodProvider.ApplicableSpan.Start) : 0;

            var lastW = (int)Width;
            var lastH = (int)Height;

            int X, Y;

            X = cmg.CompletionContext.TriggerXCoord;
            if (isCompletionWindowVisible)
            {
                // place above
                Y = ctx.TriggerYCoord - lineHeight - (int)lastH - 10;
            }
            else
            {
                // place below
                Y = ctx.TriggerYCoord;
            }

            if (X + lastW > geometry.Right)
            {
                X = (int)geometry.Right - (int)lastW;
            }
            if (Y < geometry.Top)
            {
                Y = ctx.TriggerYCoord;
            }
            if (Y + lastH > geometry.Bottom)
            {
                Y = Y - lineHeight - (int)lastH - 4;
            }

            if (isCompletionWindowVisible)
            {
                var completionWindow = new Xwt.Rectangle(CompletionWindowManager.X, CompletionWindowManager.Y - lineHeight, CompletionWindowManager.Wnd.Allocation.Width, CompletionWindowManager.Wnd.Allocation.Height + lineHeight * 2);
                if (completionWindow.IntersectsWith(new Xwt.Rectangle(X, Y, lastW, lastH)))
                {
                    X = (int)completionWindow.X;
                    Y = (int)completionWindow.Y - (int)lastH - 6;
                    if (Y < 0)
                    {
                        Y = (int)completionWindow.Bottom + 6;
                    }
                }
            }
            Location = new Xwt.Point(X, Y);
        }