Ævar Arnfjörð Bjarmason [off-list ref] writes:

Remove the cmd_sync() wrapper for "git submodule--helper sync" in
favor of dispatching the raw command-line directly to the helper.

At this point we've already parsed out the optional "--quiet" flag
that we need to support for "git submodule --quiet" (as opposed to
"git submodule <subcommand> --quiet").

For a moment, I thought this was saying that we're dropping support for
"git submodule <subcommand> --quiet" in favor of "git submodule
--quiet", but that's not true. Both are still supported, albeit in
slightly different ways:

- The subcommand "--quiet" flag is passed via $@

- The top level "--quiet" flag is parsed when we parse top level flags,
  which sets quiet=1, and thus passes "--quiet" to submodule--helper.
  We also `shift` out the "--quiet" so there's no fear of passing
  "--quiet" twice.

Hooray!