checkout @{-N}: handle rebases #657

Job	Run time
config	7s
win+VS build	0s
documentation	3m 40s
sparse	2m 57s
linux-musl (alpine)	6m 20s
linux32 (daald/ubuntu32:xenial)	13m 26s
pedantic (fedora)	5m 48s
static-analysis	3m 21s
win build	4m 52s
win+VS test	0s
linux-asan-ubsan (ubuntu-latest)	29m 27s
linux-gcc (ubuntu-20.04)	7m 9s
linux-gcc-default (ubuntu-latest)	9m 9s
linux-sha256 (ubuntu-latest)	9m 34s
linux-leaks (ubuntu-latest)	16m 49s
linux-TEST-vars (ubuntu-20.04)	7m 7s
osx-clang (macos-13)	35m 58s
osx-gcc (macos-13)	31m 33s
win test (0)	5m 29s
win test (1)	4m 15s
win test (2)	7m 15s
win test (3)	14m 34s
win test (5)	15s
win test (4)	6m 56s
win test (6)	12m 29s
win test (7)	3m 53s
win test (9)	4m 17s
win test (8)	6m 16s
	4h 12m 56s

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