Ensure that required triangles are preserved #607

Job	Run time
mmg-debug / ci (ubuntu-20.04, on, off, on, off, int32_t)	1h 17m 10s
mmg-debug / ci (ubuntu-20.04, on, off, off, off, int32_t)	1h 34m 17s
mmg-debug / ci (ubuntu-20.04, off, off, on, off, int32_t)	1h 1m 52s
mmg-debug / ci (ubuntu-20.04, off, off, off, off, int32_t)	1h 14m 36s
mmg-debug / ci (macos-12, on, off, on, off, int32_t)	50m 58s
mmg-debug / ci (macos-12, on, off, off, off, int32_t)	56m 11s
mmg-debug / ci (macos-12, off, off, on, off, int32_t)	32m 14s
mmg-debug / ci (macos-12, off, off, off, off, int32_t)	55m 22s
mmg-debug / ci (ubuntu-20.04, off, off, off, on, int32_t)	4m 6s
mmg-debug / ci (macos-12, off, off, off, on, int32_t)	8m 37s
mmg-debug / ci (ubuntu-20.04, off, on, on, off, int32_t)	1h 2m 12s
mmg-debug / ci (macos-12, off, on, on, off, int32_t)	31m 34s
mmg-debug / ci (windows-2022, off, off, off, off, int32_t)	57m 26s
mmg-debug / ci (windows-2022, on, off, off, off, int32_t)	55m 45s
mmg-debug / ci (windows-2022, off, on, off, off, int32_t)	56m 14s
mmg-debug / ci (ubuntu-20.04, on, on, on, on, int64_t)	4m 2s
mmg-debug / ci (ubuntu-20.04, off, off, on, on, int64_t)	1h 9m 4s
mmg-debug / ci (ubuntu-20.04, off, off, off, off, int64_t)	2m 5s
mmg-debug / ci (macos-12, on, on, on, on, int64_t)	8m 3s
mmg-debug / ci (macos-12, off, off, off, off, int64_t)	3m 39s
mmg-debug / ci (windows-2022, on, on, off, off, int64_t)	4m 35s
mmg-debug / ci (windows-2022, off, off, off, off, int64_t)	4m 47s
mmg-debug / upload_coverage	1m 55s
	14h 36m 44s

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