Update round off vertex to support modification/removal #1523

Job	Run time
stylecheck	33s
build-opensuse (all)	27m 14s
build-arch (all)	22m 23s
build-opensuse (horizon.so)	8m 12s
build-arch (horizon.so)	7m 15s
build (ubuntu:focal, g++, gcc, all)	26m 41s
build-pr-review	6m 47s
build (ubuntu:focal, g++, gcc, horizon.so)	7m 18s
build (ubuntu:jammy, g++, gcc, all)	20m 12s
build-debug	22m 26s
build (ubuntu:jammy, g++, gcc, horizon.so)	8m 58s
build (ubuntu:lunar, g++, gcc, all)	23m 1s
build (ubuntu:lunar, g++, gcc, horizon.so)	10m 12s
build (debian:bullseye, g++, gcc, all)	22m 2s
build (debian:bullseye, g++, gcc, horizon.so)	6m 59s
build (debian:bookworm, clang, clang, all)	20m 22s
build (debian:bookworm, clang, clang, horizon.so)	4m 31s
build (debian:bookworm, g++, gcc, all)	31m 15s
build (debian:bookworm, g++, gcc, horizon.so)	4m 49s
	4h 41m 10s

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