src/StructuredLogViewer.Avalonia/Controls/SplitterPanel.cs [127:173]:
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                gridSplitter.Height = 5;
                gridSplitter.HorizontalAlignment = HorizontalAlignment.Stretch;
                gridSplitter.VerticalAlignment = VerticalAlignment.Stretch;
            }

            if (FirstChild != null)
            {
                SetRow(FirstChild, 0);
                SetColumn(FirstChild, 0);
                SetRowSpan(FirstChild, 1);
                SetColumnSpan(FirstChild, 1);
                Children.Add(FirstChild);
            }

            Children.Add(gridSplitter);

            if (SecondChild != null)
            {
                if (Orientation == Orientation.Horizontal)
                {
                    SetRow(SecondChild, 0);
                    SetColumn(SecondChild, 2);
                }
                else
                {
                    SetRow(SecondChild, 2);
                    SetColumn(SecondChild, 0);
                }

                SetRowSpan(SecondChild, 1);
                SetColumnSpan(SecondChild, 1);
                Children.Add(SecondChild);
            }

            UpdateSplitterVisibility();
        }

        private GridLength oldFirstSize;
        private GridLength oldSecondSize;
        private static readonly GridLength zero = new GridLength(0);
        private static readonly GridLength separatorSize = new GridLength(5);

        private void UpdateSplitterVisibility()
        {
            bool isFirstChildVisible = FirstChild != null && FirstChild.IsVisible;
            bool isSecondChildVisible = SecondChild != null && SecondChild.IsVisible;
            bool areBothVisible = isFirstChildVisible && isSecondChildVisible;
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src/StructuredLogViewer/Controls/SplitterPanel.cs [145:191]:
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                gridSplitter.Height = 5;
                gridSplitter.HorizontalAlignment = HorizontalAlignment.Stretch;
                gridSplitter.VerticalAlignment = VerticalAlignment.Stretch;
            }

            if (FirstChild != null)
            {
                SetRow(FirstChild, 0);
                SetColumn(FirstChild, 0);
                SetRowSpan(FirstChild, 1);
                SetColumnSpan(FirstChild, 1);
                Children.Add(FirstChild);
            }

            Children.Add(gridSplitter);

            if (SecondChild != null)
            {
                if (Orientation == Orientation.Horizontal)
                {
                    SetRow(SecondChild, 0);
                    SetColumn(SecondChild, 2);
                }
                else
                {
                    SetRow(SecondChild, 2);
                    SetColumn(SecondChild, 0);
                }

                SetRowSpan(SecondChild, 1);
                SetColumnSpan(SecondChild, 1);
                Children.Add(SecondChild);
            }

            UpdateSplitterVisibility();
        }

        private GridLength oldFirstSize;
        private GridLength oldSecondSize;
        private static readonly GridLength zero = new GridLength(0);
        private static readonly GridLength separatorSize = new GridLength(5);

        private void UpdateSplitterVisibility()
        {
            bool isFirstChildVisible = FirstChild != null && FirstChild.IsVisible;
            bool isSecondChildVisible = SecondChild != null && SecondChild.IsVisible;
            bool areBothVisible = isFirstChildVisible && isSecondChildVisible;
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