/// <summary>
/// Handles the resize functionality of the split for a horizontal window
/// </summary>
private void ResizeVerticalSplit()
{
float height = GetConstrainedValue();
Rect resizeHandleRect = new Rect(availableRect.x,
height, availableRect.width, 2f);
GUIExtensions.DrawHorizontalLine(resizeHandleRect, Color.gray);
EditorGUIUtility.AddCursorRect(resizeHandleRect, MouseCursor.ResizeVertical);
CheckIsResizing(resizeHandleRect, SplitDirection.Vertical);
}