Hmm... For what it`s worth, another two to try out (note addition of 
"--ancestry-path"):

(*1*) git log --graph --format=%h --sparse --full-history --ancestry-path 
9ba8f06829b2d2170f23254ed3fe8f3727fe56dc..branchA

(*2*) git log --graph --format=%h --sparse --full-history --ancestry-path 
9ba8f06829b2d2170f23254ed3fe8f3727fe56dc..branchB

Hopefully, these two can show a bit simpler graphs of how 
9ba8f06829b2d2170f23254ed3fe8f3727fe56dc eventually gets in both "branchA" 
and "branchB".

On Tuesday, August 8, 2017 at 10:12:21 PM UTC+2, Chris Murphy wrote:
>
> Definitely:
>
> - branches made from branchA which are merged into branchA
> - branchA has been merged into branchB at least once
>
> and probably:
> branches made from branchA which are merged into branchB
>
> Here's the result of the commands - doesn't seem like they affected the 
> doubledot result:
>
>
> ± % git log --format=%H --sparse --full-history branchA..branchB | grep 
> 9ba8f06829b2d2170f23254ed3fe8f3727fe56dc
> 9ba8f06829b2d2170f23254ed3fe8f3727fe56dc
>
> ± % git log --format=%H --sparse --full-history branchA | grep 
> 9ba8f06829b2d2170f23254ed3fe8f3727fe56dc
> 9ba8f06829b2d2170f23254ed3fe8f3727fe56dc
>
> ± % git log --format=%H --sparse --full-history branchB | grep 
> 9ba8f06829b2d2170f23254ed3fe8f3727fe56dc
> 9ba8f06829b2d2170f23254ed3fe8f3727fe56dc
>
> ± % shasum <(git log --format=%H branchA..branchB) <(git log --format=%H 
> --sparse --full-history branchA..branchB)
> 5491c7ae2b37eaa77609ac99ecb777f435ed20f9  /dev/fd/11
> 5491c7ae2b37eaa77609ac99ecb777f435ed20f9  /dev/fd/12
>
>
> I did some long-shot exploring as well. I thought it might be interesting 
> to try to narrow down when this problem "happened". 
>
> ± % git log branchA --oneline | head -1100 | while read id junk; do git 
> log $id..branchB | grep 9ba8f06829b2d2170f23254ed3fe8f3727fe56dc || echo 
> $id; done | grep -v commit
> d257212899
> 07c8974cbf
> 8c9dac3f13
> 190772b842
> 33ae1d39bd
> 4ff39884f6
> 283e0c6056
>
> Essentially, if you walk down the git log for branchA, you get all "false 
> positives" until d257212899 which is "correct". (And after 283e0c6056, the 
> next several hundred are correct as well)
>
> That makes 1a6035b06eebbeed6ce2ea4bf3058360f261f8fa the "last" (according 
> to git log order) false positive. 
> Was hoping that closer look at that commit will help, but haven't found 
> anything yet.
>
>
> On Tuesday, August 8, 2017 at 3:54:16 PM UTC-4, Igor Djordjevic wrote:
>>
>> On Tuesday, August 8, 2017 at 2:38:09 PM UTC+2, Chris Murphy wrote:
>>>
>>> You're right, I didn't mean to leave the --tags=1 in. I double checked 
>>> that the --tags and greps didn't remove any lines from the output.
>>>
>>> However, I did overlook the carat syntax - on zsh, those need to be 
>>> escaped. I repeated this with escapes and also double-checked against bash 
>>> just in case. I think this is what you wanted:
>>>
>>> https://gist.github.com/cmurphycode/5df15669ce1e5c33f3e69d997b465d6d
>>>
>>
>> This one looks interesting, as we can see both 03dd551f03 (merge base) 
>> and 9ba8f06829 (your initial "surprising" commit) in there. By the looks of 
>> that graph only, it seems clear that 9ba8f06829 does not belong to 
>> "branchA" (its graph ending with merge base commit) -- but, that may be 
>> true considering "branchA", "branchB" and the merge base commit 
>> 03dd551f03 _only_.
>>
>> Do you have other branches in your repository, where some of them 
>> are/were merged to/with these two branches we`re looking at? If so, that 
>> might explain the situation further.
>>
>> But even if not, I`m thinking if Git`s *"history simplification"* 
>> <https://git-scm.com/docs/git-log#_history_simplification>[1] could be 
>> the the culprit here...? Could you try your initial commands again, but 
>> adding "--sparse" and "--full-history" to them as well? I`m not sure if 
>> there are any other "do not simplify history" switches.
>>
>> So if you could try running something like this (note %h changed to %H as 
>> well):
>>
>> (*1*) $ git log --format=%H --sparse --full-history branchA..branchB | 
>> grep 9ba8f06829b2d2170f23254ed3fe8f3727fe56dc
>>
>> (*2*) $ git log --format=%H --sparse --full-history branchA | grep 
>> 9ba8f06829b2d2170f23254ed3fe8f3727fe56dc
>>
>> (*3*) $ git log --format=%H --sparse --full-history branchB | grep 
>> 9ba8f06829b2d2170f23254ed3fe8f3727fe56dc
>>
>>
>> https://gist.github.com/cmurphycode/114c869323d6d161fd77aa924e769bcd
>>>
>>> Here's what the branches point to as of right now, just to be sure :)
>>>
>>> ± % git show-ref branchA
>>> c7770ea9a062d189dc2e3238bdd6f5987d86e1cb refs/heads/branchA
>>>
>>> ± % git show-ref branchB
>>> 944405f8308c77200f7f4cb860a3f95a7a8ba6dd refs/heads/branchB
>>>
>>> Thanks for your patience, I appreciate the help!
>>>
>>
>> No problem, I`m not sure how much helpful I`ll prove to be in the end, 
>> but I do find the case interesting, learning something new myself :)
>>
>> [1] https://git-scm.com/docs/git-log#_history_simplification
>>
>> Regards,
>> Buga
>>
>

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