Fix dual flip after postsolve #3282

Job	Run time
build (x86_64-linux-gnu-cxx11)	8m 30s
build (aarch64-apple-darwin)	8m 27s
build (x86_64-w64-mingw32-cxx11)	12m 43s
test (aarch64-apple-darwin, macos-14, aarch64)	11m 5s
test (x86_64-w64-mingw32-cxx11, windows-latest, x64)	11m 41s
test (x86_64-linux-gnu-cxx11, ubuntu-latest, x64)	12m 19s
	1h 4m 45s

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