Re: [PATCH v2] submodules: fix of regression on fetching of non-init subsub-repo

> I would maybe add more details here, something like the following 
> (we can cite your previous attempt, because it was merged to 'master'):
>
> The first attempt to fix this regression, in 1b7ac4e6d4
> (submodules: fix of regression on fetching of non-init
> subsub-repo, 2020-11-12), by simply reverting a62387b, resulted in
> an infinite loop of submodule fetches in the simpler case of a
> recursive fetch of a superproject with uninitialized submodules,
> and so this commit was reverted in 7091499bc0 (Revert "submodules:
> fix of regression on fetching of non-init subsub-repo",
> 2020-12-02).  To prevent future breakages, also add a regression
> test for this scenario.