Scanline Sync tweaks #3980

Job	Run time
msys2-build-test (CLANG64, windows-latest)	6m 21s
msys2-build-test (MINGW64, windows-latest)	8m 22s
msys2-build-test (UCRT64, windows-latest)	9m 0s
msys2-build-test (CLANGARM64, windows-11-arm)	9m 54s
	33m 37s

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