private bool SettingValueMatches()

in src/Model/Settings.cs [708:809]
101 lines of code
36 McCabe index (conditional complexity)

        private bool SettingValueMatches(object existing, object newValue)
        {
            if (existing == null && newValue != null)
            {
                return false;
            }
            else if (existing != null && newValue == null)
            {
                return false;
            }
            else if (existing is IXmlSerializable)
            {
                // then object comparison is enough.
                return existing != newValue;
            }
            else if (existing is int i1)
            {
                return newValue is int i2 && i1 == i2;
            }
            else if (existing is string s1)
            {
                return newValue is String s2 && s1 == s2;
            }
            else if (existing is bool b1)
            {
                return newValue is bool b2 && b1 == b2;
            }
            else if (existing is ColorTheme ct1)
            {
                return newValue is ColorTheme ct2 && ct1 == ct2;
            }
            else if (existing is Uri u1)
            {
                return newValue is Uri u2 && u1 == u2;
            }
            else if (existing is DateTime dt1)
            {
                return newValue is DateTime dt2 && dt1 == dt2;
            }
            else if (existing is TimeSpan ts1)
            {
                return newValue is TimeSpan ts2 && ts1 == ts2;
            }
            else if (existing is IndentChar ic1)
            {
                return newValue is IndentChar ic2 && ic1 == ic2;
            }
            else if (existing is Color c1)
            {
                return newValue is Color c2 && c1 == c2;
            }
            else if (existing is ThemeColors tc1)
            {
                return newValue is ThemeColors tc2 && tc1 == tc2;
            }
            else if (existing is Hashtable h1)
            {
                if (newValue is Hashtable h2)
                {
                    foreach (var key in h1.Keys)
                    {
                        var v1 = h1[key];
                        var v2 = h2[key];
                        if (!SettingValueMatches(v1, v2))
                        {
                            return false;
                        }
                    }
                    return true;
                }
                return false;
            }
            else if (existing is Array a1)
            {
                if (newValue is Array a2)
                {
                    if (a1.Length != a2.Length)
                    {
                        return false;
                    }
                    for (int i = 0; i < a1.Length; i++)
                    {
                        object v1 = a1.GetValue(i);
                        object v2 = a2.GetValue(i);
                        if (!SettingValueMatches(v1, v2))
                        {
                            return false;
                        }
                    }
                    return true;
                }
                return false;
            }
            else if (this.comparer != null)
            {
                return this.comparer(existing, newValue);
            }
            else
            {
                return false;
            }
        }