git clone --recursive should run git submodule update with flag --remote

Consider two repositories, A and B.

Repo A is embedded into B by using submodule:

  git submodule add -b master <url-to-A> sub-a

So, submodule sub-a is set to track master branch of the repo A.

Running git submodule update --remote inside repo B will automatically update and checkout submodule sub-a to the latest master commit (as expected).

However, when using git clone --recursive <url-to-B>, repo B will be cloned with submodule A checkouted to the commmit which was recorded on git submodule add command, not the master commit.

Expected behaviour is to automatically update checkout commit pointed by branch, that was specified by -b flag in the git submodule add invocation.

Reason for this behaviour is that line:

  https://github.com/git/git/blob/master/builtin/clone.c#L99

I guess, it should be changed to include --remote flag.