Multi-patch series broken in b4 master

[Geert Uytterhoeven <geert@linux-m68k.org>]

Hi Konstantin,

Commit c2e1aa9cbbf3d89a ("Save exploded pull requests as maildirs
as well") broke patch series containing more than one patch, as the
resulting .mbx file no longer has the needed separators between emails.

I first noticed when using formail and checkpatch:

    $ cat *mbx | formail -s scripts/checkpatch.pl
    WARNING: added, moved or deleted file(s), does MAINTAINERS need updating?
    #28:
    new file mode 100644

    WARNING: DT binding docs and includes should be a separate patch.
See: Documentation/devicetree/bindings/submitting-patches.rst

    WARNING: email address 'linux-clk@vger.kernel.org,
devicetree@vger.kernel.org' might be better as
'linux-clk@vger.kernel.org devicetree@vger.kernel.org'
    #131:
    To: linux-clk@vger.kernel.org, devicetree@vger.kernel.org

    WARNING: Unexpected content after email:
'linux-clk@vger.kernel.org, devicetree@vger.kernel.org', should be:
'linux-clk@vger.kernel.org (devicetree@vger.kernel.org)'
    #131:
    To: linux-clk@vger.kernel.org, devicetree@vger.kernel.org

    WARNING: Duplicate signature
    #144:
    Signed-off-by: Daniel Mack <daniel@zonque.org>
    [...]

But apparently "git am" has issues with the .mbx file, too:

b4 master:

    $ b4 am 20210519201551.690654-1-daniel@zonque.org
    Looking up https://lore.kernel.org/r/20210519201551.690654-1-daniel%40zonque.org
    Analyzing 7 messages in the thread
    Checking attestation on all messages, may take a moment...
    ---
      [PATCH v2 1/3] dt-bindings: clock: convert cs2000-cp bindings to yaml
        + Reviewed-by: Rob Herring <robh@kernel.org>
      [PATCH v2 2/3] dt-bindings: clock: cs2000-cp: Document aux-output-source
        + Reviewed-by: Rob Herring <robh@kernel.org>
      [PATCH v2 3/3] clk: cs2000-cp: Make aux output function controllable
    ---
    Total patches: 3
    ---
    Cover: ./v2_20210519_daniel_clk_cs2000_cp_make_aux_output_pin_configurable.cover
     Link: https://lore.kernel.org/r/20210519201551.690654-1-daniel@zonque.org
     Base: not found (applies clean to current tree)
           git am
./v2_20210519_daniel_clk_cs2000_cp_make_aux_output_pin_configurable.mbx
    $ git am -s *mbx
    Applying: dt-bindings: clock: convert cs2000-cp bindings to yaml

And the single commit contains the changes of all 3 patches.

b4 v0.7.2:

    $ b4 am 20210519201551.690654-1-daniel@zonque.org
    Looking up https://lore.kernel.org/r/20210519201551.690654-1-daniel%40zonque.org
    Analyzing 7 messages in the thread
    Checking attestation on all messages, may take a moment...
    ---
      [PATCH v2 1/3] dt-bindings: clock: convert cs2000-cp bindings to yaml
        + Reviewed-by: Rob Herring <robh@kernel.org>
      [PATCH v2 2/3] dt-bindings: clock: cs2000-cp: Document aux-output-source
        + Reviewed-by: Rob Herring <robh@kernel.org>
      [PATCH v2 3/3] clk: cs2000-cp: Make aux output function controllable
    ---
    Total patches: 3
    ---
    Cover: ./v2_20210519_daniel_clk_cs2000_cp_make_aux_output_pin_configurable.cover
     Link: https://lore.kernel.org/r/20210519201551.690654-1-daniel@zonque.org
     Base: not found (applies clean to current tree)
           git am
./v2_20210519_daniel_clk_cs2000_cp_make_aux_output_pin_configurable.mbx
    $ git am -s *mbx
    Applying: dt-bindings: clock: convert cs2000-cp bindings to yaml
    Applying: dt-bindings: clock: cs2000-cp: Document aux-output-source
    Applying: clk: cs2000-cp: Make aux output function controllable

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds