Subsequent errors in difference related to switch traversal

This is a follow up of issue #869 and the pull request #887

@kleunen found an issue with this code (I adapted it slightly to give more output):

```

#include

#include
#include
#include
#include

using point_t = boost::geometry::model::d2::point_xy;
using polygon_t = boost::geometry::model::polygon;
using ring_t = boost::geometry::model::ring;
using multi_polygon_t = boost::geometry::model::multi_polygon;

int main()
{
std::vector input(39);

boost::geometry::read_wkt("MULTIPOLYGON(((0.603549 0.394417,0.517116 0.432156,0.563288 0.385417,0.492528 0.36544,0.577515 0.295956,0.550593 0.255888,0.452782 0.221035,0.459249 0.333709,0.441865 0.351136,0.370548 0.331001,0.385816 0.296593,0.394882 0.293488,0.387958 0.291767,0.423911 0.210747,0.392721 0.199633,0.310001 0.272391,0.236386 0.254095,0.304173 0.168082,0.296274 0.165267,0.207506 0.246917,0.0140798 0.198842,0.069792 0.24609,0.0159663 0.230894,0.0815688 0.362756,0.0156364 0.423401,0.0977468 0.395274,0.108341 0.416568,0.135246 0.382428,0.203132 0.359173,0.207309 0.362716,0.174164 0.39187,0.173365 0.391061,0.173401 0.392541,0.11983 0.439661,0.177364 0.555306,0.177972 0.580239,0.0906064 0.618386,0.127028 0.663916,0.0564116 0.721999,0.127196 0.664127,0.181673 0.732227,0.182236 0.755361,0.188638 0.740934,0.199131 0.754051,0.261029 0.691392,0.320648 0.715618,0.224866 0.786223,0.382462 0.983231,0.466763 0.85994,0.47812 0.838165,0.39515 0.926659,0.476824 0.77908,0.50332 0.789847,0.525393 0.747525,0.505459 0.72734,0.547556 0.651273,0.566996 0.667759,0.59721 0.609827,0.598711 0.558841,0.604247 0.548838,0.621545 0.563169,0.680308 0.450499,0.643761 0.47744,0.668916 0.431986,0.656761 0.413896,0.600941 0.483052,0.603549 0.394417)))", input[0]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.696266 0.142785,0.719425 0.179933,0.684151 0.208773,0.625869 0.119956,0.523067 0.0866194,0.476025 0.144909,0.550593 0.255888,0.603476 0.274731,0.577515 0.295956,0.605233 0.337207,0.603549 0.394417,0.634572 0.380871,0.656761 0.413896,0.710003 0.347935,0.717162 0.344809,0.668916 0.431986,0.729259 0.521793,0.717016 0.583363,0.740154 0.558685,0.74515 0.545443,0.748247 0.550053,0.751874 0.546184,0.780115 0.586441,0.783115 0.512864,0.842285 0.449754,0.788997 0.368549,0.791284 0.312445,0.799738 0.308754,0.992212 0.617482,0.959288 0.239088,0.973756 0.232771,0.958302 0.22776,0.938553 0.000778765,0.745381 0.158712,0.696266 0.142785)))", input[1]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.287131 0.506261,0.174164 0.39187,0.173401 0.392541,0.177364 0.555306,0.187664 0.576007,0.177972 0.580239,0.178814 0.61485,0.142867 0.650888,0.127028 0.663916,0.127196 0.664127,0.178983 0.621787,0.181673 0.732227,0.188638 0.740934,0.226862 0.654796,0.241025 0.683264,0.261029 0.691392,0.36551 0.585627,0.305289 0.524648,0.289209 0.531669,0.301942 0.521258,0.291026 0.510204,0.297299 0.496067,0.287131 0.506261)))", input[2]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.385816 0.296593,0.387958 0.291767,0.310001 0.272391,0.27427 0.30382,0.211225 0.286021,0.236386 0.254095,0.207506 0.246917,0.175851 0.276034,0.069792 0.24609,0.14191 0.307253,0.0815688 0.362756,0.0977468 0.395274,0.135246 0.382428,0.173427 0.333981,0.203132 0.359173,0.216572 0.354569,0.207309 0.362716,0.315687 0.454629,0.370548 0.331001,0.323855 0.317819,0.385816 0.296593)))", input[3]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.621545 0.563169,0.59721 0.609827,0.594811 0.691349,0.566996 0.667759,0.525393 0.747525,0.544737 0.767113,0.594132 0.714429,0.591197 0.814158,0.609997 0.833195,0.590866 0.825421,0.586751 0.965255,0.666999 0.75257,0.606487 0.701251,0.685935 0.616513,0.621545 0.563169)))", input[4]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.719425 0.179933,0.778422 0.274563,0.76895 0.322197,0.791284 0.312445,0.791944 0.296253,0.799738 0.308754,0.959288 0.239088,0.958302 0.22776,0.745381 0.158712,0.719425 0.179933)))", input[5]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.304173 0.168082,0.392721 0.199633,0.448726 0.150373,0.445833 0.0999749,0.468192 0.133251,0.521709 0.086179,0.399861 0.0466657,0.304173 0.168082)))", input[6]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.780115 0.586441,0.779691 0.59685,0.748247 0.550053,0.740154 0.558685,0.710619 0.636962,0.961172 0.844534,0.780115 0.586441)))", input[7]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.684151 0.208773,0.603476 0.274731,0.607034 0.275999,0.605233 0.337207,0.634572 0.380871,0.710003 0.347935,0.727272 0.326541,0.717162 0.344809,0.76089 0.325716,0.684151 0.208773)))", input[8]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.320648 0.715618,0.476824 0.77908,0.505459 0.72734,0.420902 0.641717,0.320648 0.715618)))", input[9]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.59913 0.544599,0.604247 0.548838,0.643761 0.47744,0.60016 0.509579,0.600941 0.483052,0.570444 0.520834,0.577247 0.52647,0.482633 0.596213,0.547556 0.651273,0.598711 0.558841,0.59913 0.544599)))", input[10]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.729259 0.521793,0.74515 0.545443,0.74732 0.539692,0.751874 0.546184,0.783115 0.512864,0.788997 0.368549,0.766538 0.334324,0.729259 0.521793)))", input[11]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.328117 0.465171,0.348942 0.482832,0.492528 0.36544,0.441865 0.351136,0.328117 0.465171)))", input[12]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.696266 0.142785,0.611653 0.00706631,0.573697 0.0404517,0.625869 0.119956,0.696266 0.142785)))", input[13]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.413212 0.537338,0.36551 0.585627,0.420902 0.641717,0.482633 0.596213,0.413212 0.537338)))", input[14]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.199131 0.754051,0.013265 0.942202,0.224866 0.786223,0.199131 0.754051)))", input[15]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.287131 0.506261,0.240627 0.552881,0.187664 0.576007,0.197613 0.596005,0.178814 0.61485,0.178983 0.621787,0.201344 0.603505,0.226862 0.654796,0.277112 0.541559,0.289209 0.531669,0.279648 0.535844,0.291026 0.510204,0.287131 0.506261)))", input[16]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.366654 0.497853,0.413212 0.537338,0.517116 0.432156,0.366654 0.497853)))", input[17]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.173427 0.333981,0.211225 0.286021,0.175851 0.276034,0.14191 0.307253,0.173427 0.333981)))", input[18]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.591197 0.814158,0.544737 0.767113,0.517876 0.795762,0.590866 0.825421,0.591197 0.814158)))", input[19]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.216572 0.354569,0.323855 0.317819,0.27427 0.30382,0.216572 0.354569)))", input[20]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.108341 0.416568,0.0230624 0.524775,0.11983 0.439661,0.108341 0.416568)))", input[21]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.663637 0.851798,0.711342 0.790176,0.681007 0.764449,0.663637 0.851798)))", input[22]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.663637 0.851798,0.60596 0.926301,0.651077 0.91496,0.663637 0.851798)))", input[23]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.279648 0.535844,0.240627 0.552881,0.197613 0.596005,0.201344 0.603505,0.277112 0.541559,0.279648 0.535844)))", input[24]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.701609 0.660841,0.666999 0.75257,0.681007 0.764449,0.701609 0.660841)))", input[25]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.366654 0.497853,0.348942 0.482832,0.301942 0.521258,0.305289 0.524648,0.366654 0.497853)))", input[26]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.791944 0.296253,0.796543 0.183435,0.778422 0.274563,0.791944 0.296253)))", input[27]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.450246 0.176853,0.425156 0.207942,0.423911 0.210747,0.452782 0.221035,0.450246 0.176853)))", input[28]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.70696 0.633931,0.717016 0.583363,0.685935 0.616513,0.70696 0.633931)))", input[29]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.450246 0.176853,0.476025 0.144909,0.468192 0.133251,0.448726 0.150373,0.450246 0.176853)))", input[30]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.47812 0.838165,0.517876 0.795762,0.50332 0.789847,0.47812 0.838165)))", input[31]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.59913 0.544599,0.60016 0.509579,0.577247 0.52647,0.59913 0.544599)))", input[32]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.297299 0.496067,0.328117 0.465171,0.315687 0.454629,0.297299 0.496067)))", input[33]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.573697 0.0404517,0.5677 0.0313133,0.527613 0.0809854,0.573697 0.0404517)))", input[34]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.594132 0.714429,0.606487 0.701251,0.594811 0.691349,0.594132 0.714429)))", input[35]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.701609 0.660841,0.710619 0.636962,0.70696 0.633931,0.701609 0.660841)))", input[36]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.76089 0.325716,0.766538 0.334324,0.76895 0.322197,0.76089 0.325716)))", input[37]);
boost::geometry::read_wkt("MULTIPOLYGON(((0.527613 0.0809854,0.521709 0.086179,0.523067 0.0866194,0.527613 0.0809854)))", input[38]);

std::cout << std::boolalpha << std::setprecision(12);

int n = 0;
std::reverse(input.begin(), input.end());
while(input.size() > 1) {
std::size_t divide_i = input.size() / 2 + input.size() % 2;
for(std::size_t i = 0; i < input.size() / 2; ++i) {
std::size_t index = i + divide_i;
if(index < input.size()) {
multi_polygon_t result;
boost::geometry::sym_difference(input[index], input[i], result);
if (!boost::geometry::is_valid(result))
{
multi_polygon_t result_a, result_b, result_i, result_u;
boost::geometry::difference(input[index], input[i], result_a);
boost::geometry::difference(input[i], input[index], result_b);
boost::geometry::intersection(input[index], input[i], result_i);
boost::geometry::union_(input[index], input[i], result_u);

std::cout << n << " validity: "
<< " 1: " << boost::geometry::is_valid(input[index])
<< " 2: " << boost::geometry::is_valid(input[i])
<< " i: " << boost::geometry::is_valid(result_i)
<< " u: " << boost::geometry::is_valid(result_u)
<< " a: " << boost::geometry::is_valid(result_a)
<< " b: " << boost::geometry::is_valid(result_b)
<< " s: " << boost::geometry::is_valid(result)
<< std::endl;

// std::cout << boost::geometry::wkt(input[index]) << std::endl;
// std::cout << boost::geometry::wkt(input[i]) << std::endl;

}
input[i] = std::move(result);
n++;
}
}

input.resize(divide_i);
}

std::cout << "Is valid: " << boost::geometry::is_valid(input[0]) << std::endl;
return 0;
}

```

The result is (both with `BOOST_GEOMETRY_NO_ROBUSTNESS` and without), in the develop branch:
`Is valid: true`
but in the branch where it is fixed:
```
34 validity: 1: true 2: true i: true u: true a: false b: true s: false
37 validity: 1: true 2: true i: true u: true a: true b: false s: false
Is valid: false
```

First set of input causing invalid output:
```
MULTIPOLYGON(((0.450246 0.176853,0.476025 0.144909,0.468192 0.133251,0.448726 0.150373,0.450246 0.176853)),((0.719425 0.179933,0.778422 0.274563,0.76895 0.322197,0.791284 0.312445,0.791944 0.296253,0.799738 0.308754,0.959288 0.239088,0.958302 0.22776,0.745381 0.158712,0.719425 0.179933)),((0.701609 0.660841,0.666999 0.75257,0.681007 0.764449,0.701609 0.660841)),((0.594132 0.714429,0.606487 0.701251,0.594811 0.691349,0.594132 0.714429)),((0.224866 0.786223,0.382462 0.983231,0.466763 0.85994,0.47812 0.838165,0.39515 0.926659,0.476824 0.77908,0.50332 0.789847,0.525393 0.747525,0.505459 0.72734,0.547556 0.651273,0.482633 0.596213,0.577247 0.52647,0.570444 0.520834,0.600941 0.483052,0.603549 0.394417,0.517116 0.432156,0.563288 0.385417,0.492528 0.36544,0.577515 0.295956,0.550593 0.255888,0.452782 0.221035,0.459249 0.333709,0.441865 0.351136,0.370548 0.331001,0.385816 0.296593,0.394882 0.293488,0.387958 0.291767,0.423911 0.210747,0.392721 0.199633,0.310001 0.272391,0.236386 0.254095,0.304173 0.168082,0.296274 0.165267,0.207506 0.246917,0.0140798 0.198842,0.069792 0.24609,0.0159663 0.230894,0.0815688 0.362756,0.0156364 0.423401,0.0977468 0.395274,0.108341 0.416568,0.135246 0.382428,0.203132 0.359173,0.207309 0.362716,0.174164 0.39187,0.173365 0.391061,0.173401 0.392541,0.11983 0.439661,0.177364 0.555306,0.177972 0.580239,0.0906064 0.618386,0.127028 0.663916,0.0564116 0.721999,0.127196 0.664127,0.181673 0.732227,0.182236 0.755361,0.188638 0.740934,0.199131 0.754051,0.261029 0.691392,0.320648 0.715618,0.224866 0.786223),(0.216572 0.354569,0.27427 0.30382,0.323855 0.317819,0.216572 0.354569)),((0.224866 0.786223,0.199131 0.754051,0.013265 0.942202,0.224866 0.786223)),((0.598711 0.558841,0.547556 0.651273,0.566996 0.667759,0.59721 0.609827,0.598711 0.558841)),((0.598711 0.558841,0.604247 0.548838,0.59913 0.544599,0.598711 0.558841)),((0.604247 0.548838,0.621545 0.563169,0.680308 0.450499,0.643761 0.47744,0.604247 0.548838)),((0.643761 0.47744,0.668916 0.431986,0.656761 0.413896,0.600941 0.483052,0.60016 0.509579,0.643761 0.47744)))
MULTIPOLYGON(((0.663637 0.851798,0.60596 0.926301,0.651077 0.91496,0.663637 0.851798)),((0.696266 0.142785,0.611653 0.00706631,0.573697 0.0404517,0.625869 0.119956,0.696266 0.142785)),((0.315687 0.454629,0.297299 0.496067,0.328117 0.465171,0.315687 0.454629)),((0.211225 0.286021,0.236386 0.254095,0.207506 0.246917,0.175851 0.276034,0.211225 0.286021)),((0.211225 0.286021,0.173427 0.333981,0.203132 0.359173,0.216572 0.354569,0.207309 0.362716,0.315687 0.454629,0.370548 0.331001,0.323855 0.317819,0.385816 0.296593,0.387958 0.291767,0.310001 0.272391,0.27427 0.30382,0.211225 0.286021)),((0.175851 0.276034,0.069792 0.24609,0.14191 0.307253,0.175851 0.276034)),((0.14191 0.307253,0.0815688 0.362756,0.0977468 0.395274,0.135246 0.382428,0.173427 0.333981,0.14191 0.307253)),((0.684151 0.208773,0.603476 0.274731,0.607034 0.275999,0.605233 0.337207,0.634572 0.380871,0.710003 0.347935,0.727272 0.326541,0.717162 0.344809,0.76089 0.325716,0.684151 0.208773)),((0.450246 0.176853,0.425156 0.207942,0.423911 0.210747,0.452782 0.221035,0.450246 0.176853)),((0.527613 0.0809854,0.521709 0.086179,0.523067 0.0866194,0.527613 0.0809854)))

```
Second set of input:
```
MULTIPOLYGON(((0.573697 0.0404517,0.5677 0.0313133,0.527613 0.0809854,0.573697 0.0404517)),((0.663637 0.851798,0.711342 0.790176,0.681007 0.764449,0.663637 0.851798)),((0.328117 0.465171,0.348942 0.482832,0.492528 0.36544,0.441865 0.351136,0.328117 0.465171)),((0.59913 0.544599,0.60016 0.509579,0.577247 0.52647,0.59913 0.544599)),((0.780115 0.586441,0.779691 0.59685,0.748247 0.550053,0.740154 0.558685,0.710619 0.636962,0.961172 0.844534,0.780115 0.586441)),((0.791944 0.296253,0.796543 0.183435,0.778422 0.274563,0.791944 0.296253)),((0.76089 0.325716,0.766538 0.334324,0.76895 0.322197,0.76089 0.325716)),((0.36551 0.585627,0.420902 0.641717,0.482633 0.596213,0.413212 0.537338,0.36551 0.585627)),((0.36551 0.585627,0.305289 0.524648,0.289209 0.531669,0.301942 0.521258,0.291026 0.510204,0.297299 0.496067,0.287131 0.506261,0.174164 0.39187,0.173401 0.392541,0.177364 0.555306,0.187664 0.576007,0.177972 0.580239,0.178814 0.61485,0.142867 0.650888,0.127028 0.663916,0.127196 0.664127,0.178983 0.621787,0.181673 0.732227,0.188638 0.740934,0.226862 0.654796,0.241025 0.683264,0.261029 0.691392,0.36551 0.585627),(0.279648 0.535844,0.277112 0.541559,0.201344 0.603505,0.197613 0.596005,0.240627 0.552881,0.279648 0.535844)),((0.413212 0.537338,0.517116 0.432156,0.366654 0.497853,0.413212 0.537338)),((0.590866 0.825421,0.591197 0.814158,0.544737 0.767113,0.517876 0.795762,0.590866 0.825421)),((0.590866 0.825421,0.586751 0.965255,0.666999 0.75257,0.606487 0.701251,0.685935 0.616513,0.621545 0.563169,0.59721 0.609827,0.594811 0.691349,0.566996 0.667759,0.525393 0.747525,0.544737 0.767113,0.594132 0.714429,0.591197 0.814158,0.609997 0.833195,0.590866 0.825421)),((0.420902 0.641717,0.320648 0.715618,0.476824 0.77908,0.505459 0.72734,0.420902 0.641717)),((0.685935 0.616513,0.70696 0.633931,0.717016 0.583363,0.685935 0.616513)))
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```