backport: Fix corner cases of combine_selection. (#1038, #1040) #1310

Job	Run time
CMake_Project (serial)	1m 2s
Linux_HDF5_Versions (hdf5-1_8_23)	6m 28s
CMake_Project (parallel)	1m 25s
Benchmarks	40s
Linux_HDF5_Versions (hdf5-1_10_11)	5m 41s
Linux_Compilers (clang-10, clang++-10)	6m 44s
Linux_HDF5_Versions (hdf5-1_12_3)	6m 8s
Linux_Compilers (clang-12, clang++-12)	6m 9s
Linux_HDF5_Versions (hdf5-1_14_3)	6m 6s
Linux_MPI ({ "os": "ubuntu-20.04", "pkgs": "", "flags": "-DHIGHFIVE_USE_BOOST:Bool=OFF" })	6m 49s
Linux_Compilers (gcc-9, g++-9)	12m 8s
Linux_Sanitizers (clang-12, clang++-12, address)	11m 7s
Linux_MPI ({ "os": "ubuntu-20.04", "pkgs": "libboost-all-dev libopencv-dev", "flags": "-DHIGHFIVE_USE_OPENCV:Bool=ON -GNinja" })	13m 36s
Linux_Compilers (gcc-10, g++-10)	7m 25s
Linux_MPI ({ "os": "ubuntu-latest", "pkgs": "libboost-all-dev libeigen3-dev libopencv-dev", "flags": "-DHIGHFIVE_USE_EIGEN:Bool=ON -DHIGHFIVE_USE_OPENCV:Bool=ON -GNinja" })	6m 53s
Linux_Sanitizers (clang-12, clang++-12, undefined)	5m 24s
OSX (macOS-12, 14)	11m 29s
Linux_Sanitizers (gcc-10, g++-10, On)	7m 35s
Linux_MPI ({ "os": "ubuntu-20.04", "pkgs": "libboost-all-dev", "flags": "-DCMAKE_CXX_STANDARD=17" })	13m 54s
Windows (windows-2019, 14)	7m 28s
OSX (macOS-12, 17)	13m 20s
Linux_MPI ({ "os": "ubuntu-22.04", "flags": "-DHIGHFIVE_USE_BOOST=Off -DCMAKE_CXX_STANDARD=20" })	4m 24s
Windows (windows-2019, 17)	5m 48s
OSX (macOS-12, 20)	10m 36s
Windows (windows-2019, 20)	8m 49s
Windows (windows-2022, 14)	6m 40s
Windows (windows-2022, 17)	5m 56s
Windows (windows-2022, 20)	8m 0s
	3h 27m 44s

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