checkout @{-N}: handle rebases #656

Job	Run time
config	7s
win+VS build	0s
documentation	3m 38s
sparse	2m 52s
static-analysis	7m 35s
win build	4m 51s
linux32 (daald/ubuntu32:xenial)	7m 14s
linux-musl (alpine)	6m 29s
pedantic (fedora)	1m 57s
linux-gcc (ubuntu-20.04)	6m 58s
linux-gcc-default (ubuntu-latest)	9m 11s
linux-asan-ubsan (ubuntu-latest)	42m 38s
linux-leaks (ubuntu-latest)	10m 35s
win+VS test	0s
linux-sha256 (ubuntu-latest)	9m 55s
linux-TEST-vars (ubuntu-20.04)	18m 25s
osx-clang (macos-13)	43m 2s
osx-gcc (macos-13)	28m 13s
win test (0)	5m 27s
win test (1)	4m 12s
win test (2)	7m 16s
win test (4)	7m 15s
win test (5)	5m 10s
win test (3)	6m 25s
win test (6)	15m 4s
win test (7)	3m 56s
win test (8)	7m 23s
win test (9)	4m 25s
	4h 30m 13s

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