graph: add indentation for commits preceded by a parentless commit #27251

Job	Run time
config	8s
fuzz smoke test	16m 1s
win build	5m 0s
win+Meson build	4m 3s
win+VS build	0s
static-analysis	5m 52s
sparse	3m 51s
rust-analysis	1m 24s
osx-clang (macos-14)	21m 55s
osx-gcc (macos-14)	18m 1s
osx-reftable (macos-14)	16m 20s
osx-meson (macos-14)	22m 4s
documentation	1h 43m 50s
linux-TEST-vars (ubuntu:20.04)	12m 53s
linux-meson (ubuntu:rolling)	13m 43s
linux-leaks (ubuntu:rolling)	26m 58s
linux-musl-meson (alpine:latest)	7m 50s
debian-11 (debian:11)	10m 8s
linux-breaking-changes (ubuntu:rolling)	12m 14s
fedora-breaking-changes-meson (fedora:latest)	9m 42s
linux32 (i386/ubuntu:focal)	10m 27s
linux-sha256 (ubuntu:rolling)	12m 39s
linux-reftable (ubuntu:rolling)	13m 6s
linux-asan-ubsan (ubuntu:rolling)	34m 29s
linux-reftable-leaks (ubuntu:rolling)	28m 31s
almalinux-8 (almalinux:8)	10m 43s
win+VS test	0s
win+Meson test (2)	10m 25s
win+Meson test (7)	7m 27s
win+Meson test (3)	6m 24s
win+Meson test (1)	11m 50s
win+Meson test (6)	12m 24s
win+Meson test (8)	8m 50s
win+Meson test (4)	7m 19s
win+Meson test (0)	8m 59s
win+Meson test (9)	8m 4s
win+Meson test (5)	9m 12s
win test (2)	8m 55s
win test (7)	5m 17s
win test (1)	9m 44s
win test (3)	7m 51s
win test (8)	8m 15s
win test (0)	7m 1s
win test (4)	10m 25s
win test (5)	7m 46s
win test (6)	6m 31s
win test (9)	9m 49s
	9h 54m 20s

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