[PATCH v2 0/2] support -m"<msg>" combined with commit --fixup

Here's a hopefully ready to apply v2 incorporating feedback from Eric (thanks!). A tbdiff with v1 follows below.

Ævar Arnfjörð Bjarmason (2):
  commit doc: document that -c, -C, -F and --fixup with -m error
  commit: add support for --fixup <commit> -m"<extra message>"

 Documentation/git-commit.txt | 2 ++
 builtin/commit.c             | 8 +++++---
 t/t7500-commit.sh            | 9 ++++++++-
 3 files changed, 15 insertions(+), 4 deletions(-)

1: 7d5e2531ee ! 1: 82333992ec commit doc: document that -c, -C, -F and --fixup with -m error
    @@ -7,6 +7,7 @@
         explicitly since 0c091296c0 ("git-commit: log parameter updates.",
         2005-08-08), but the documentation was never updated to reflect this.
         
    +    Wording-by: Eric Sunshine <sunshine@sunshineco.com>
         Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
     
     diff --git a/Documentation/git-commit.txt b/Documentation/git-commit.txt
    @@ -17,8 +18,8 @@
      	If multiple `-m` options are given, their values are
      	concatenated as separate paragraphs.
     ++
    -+Combining the `-m` option and any of `-c`, `-C`, `-F` or `--fixup`
    -+will result in an error.
    ++The `-m` option is mutually exclusive with `-c`, `-C`, `-F`, and
    ++`--fixup`.
      
      -t <file>::
      --template=<file>::
2: bd78a211ed ! 2: 780de6e042 commit: add support for --fixup <commit> -m"<extra message>"
    @@ -22,6 +22,21 @@
            In such a case you might want to leave a small message,
            e.g. "forgot this part, which broke XYZ".
         
    +    With this, --fixup <commit> -m"More" -m"Details" will result in a
    +    commit message like:
    +    
    +        !fixup <subject of <commit>>
    +    
    +        More
    +    
    +        Details
    +    
    +    The reason the test being added here seems to squash "More" at the end
    +    of the subject line of the commit being fixed up is because the test
    +    code is using "%s%b" so the body immediately follows the subject, it's
    +    not a bug in this code, and other tests t7500-commit.sh do the same
    +    thing.
    +    
         When the --fixup option was initially added the "Option -m cannot be
         combined" error was expanded from -c, -C and -F to also include
         --fixup[1]
    @@ -34,6 +49,7 @@
         1. d71b8ba7c9 ("commit: --fixup option for use with rebase
            --autosquash", 2010-11-02)
         
    +    Helped-by: Eric Sunshine <sunshine@sunshineco.com>
         Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
     
     diff --git a/Documentation/git-commit.txt b/Documentation/git-commit.txt
    @@ -43,10 +59,9 @@
      	If multiple `-m` options are given, their values are
      	concatenated as separate paragraphs.
      +
    --Combining the `-m` option and any of `-c`, `-C`, `-F` or `--fixup`
    --will result in an error.
    -+Combining the `-m` option and any of `-c`, `-C` or `-F` will result in
    -+an error.
    +-The `-m` option is mutually exclusive with `-c`, `-C`, `-F`, and
    +-`--fixup`.
    ++The `-m` option is mutually exclusive with `-c`, `-C`, and `-F`.
      
      -t <file>::
      --template=<file>::