Hi Ondřej,

On Fri, 17 Jan 2020, Ondrej Pohorelsky wrote:

> We have encountered a bug where merge-base is missing in bash
> completion. [1]

The `merge-base` command is not considered a user-facing command:
https://github.com/git/git/blob/v2.25.0/command-list.txt#L120
(the "plumbing" in "plumbinginterrogators" means that this is supposed to
be a low-level command, to be used in scripts, but not so much
interactively).

Therefore I think that it is intentional that this command does not
tab-complete: to declutter the list when typing git<TAB><TAB>.

Ciao,
Johannes