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This exposes a flag to recurse into submodules in builtin/checkout making use of the code implemented in prior patches. A new failure mode is introduced in the submodule update library, as the directory/submodule conflict is not solved in prior patches. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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