Because git log --graph implies "--topo-order" and I didn't want that:
$ git help log
--graph
[...]
This implies the --topo-order option by default
Without "--date-order" it looks like this:
$ git log --graph --all --decorate --oneline
* 86d911ec0f (HEAD -> master, origin/master, origin/HEAD) Allow index AMs to...
* 7c5d8c16e1 Add explicit ORDER BY to a few tests that exercise hash-join code.
* 8f93bd8512 Fix roundoff problems in float8_timestamptz() and make_interval().
* a507b86900 Add WAL consistency checking facility.
* 115cb31597 Fix relcache leaks in get_object_address_publication_rel()
* e35bbea7dd doc: Some improvements in CREATE SUBSCRIPTION ref page
* c3c4f6e174 Revise the way the element allocator for a simplehash is specified.
And 960 more commits before finally getting to this one... :-)