Expand neighbor regeneration to diagonal chunks as well #595

Job	Run time
build (ubuntu-22.04, linux, x86_64, .tgz, debug)	1m 52s
build (windows-2022, windows, x64, .zip, debug)	6m 41s
build (macos-14, macos, x86_64, .tgz, debug)	1m 34s
build (ubuntu-22.04-arm, linux, arm64, .tgz, debug)	1m 23s
build (ubuntu-22.04, linux-server, x86_64, .tgz, --serveronly=y, -server, releasedbg)	2m 44s
build (ubuntu-22.04, linux, x86_64, .tgz, releasedbg)	1m 56s
build (macos-14, macos, arm64, .tgz, debug)	1m 19s
build (macos-14, macos, x86_64, .tgz, releasedbg)	1m 6s
build (windows-2022, windows, x64, .zip, releasedbg)	10m 12s
build (ubuntu-22.04, linux-server, x86_64, .tgz, --serveronly=y, -server, debug)	2m 24s
build (macos-14, macos, arm64, .tgz, releasedbg)	1m 44s
build (ubuntu-22.04-arm, linux-server, arm64, .tgz, --serveronly=y, -server, releasedbg)	1m 58s
build (ubuntu-22.04-arm, linux-server, arm64, .tgz, --serveronly=y, -server, debug)	1m 40s
build (ubuntu-22.04-arm, linux, arm64, .tgz, releasedbg)	10m 49s
	47m 22s

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