Repair coord-set with separate rectangles #705

Job	Run time
gnumake-clang-tidy-native (clang++, c++20)	1m 16s
gcc-native-cpp_dec_float (g++, c++14)	10m 21s
gcc-native-cpp_dec_float (g++, c++20)	9m 53s
gcc-native-cpp_dec_float-asan (g++, c++20)	1m 36s
gcc-native-cpp_dec_float-tsan (g++, c++20)	3m 19s
gcc-native-cpp_dec_float-ubsan (g++, c++20)	1m 44s
gcc-native-gmp_float (g++, c++14)	6m 47s
macos-native-cpp_dec_float (g++, c++14)	7m 28s
macos-native-cpp_dec_float (g++, c++20)	7m 12s
msvc-release-x64-vs2022	8m 1s
gcc-native-gmp_float (g++, c++20)	7m 17s
gcc-native-gmp_float (clang++, c++14)	6m 55s
gcc-native-gmp_float (clang++, c++20)	7m 7s
gcc-native (g++, c++14)	9m 37s
gcc-native (g++, c++20)	9m 35s
gcc-native (clang++, c++14)	7m 59s
gcc-native (clang++, c++20)	8m 40s
	1h 54m 47s

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