Git Gui 0.20 messes up UTF-8 author names when amending a commit

From: Roessner Silvester SGD AS-ER/QMM1 * <silvester.roessner@bosch.com>
Date: Jun 29, 2016, 05:56 UTC
Message-ID: <52E1627956F20E458D872C5961027EDC654FE17C@SGDS00759.zf-lenksysteme.net>

Hi,

first I want to thank all involved in developing git. It is really one of the - no! - it is the greatest tool I ever worked with!

So I want to help improving it at least with this bug report.

Since git version 2.9.0 git git-gui messes up my author name
- which contains UTF-8 characters: Silvester Rößner -
when I amend a commit.

When I do the same with git-bash it's all ok.

git log after first amend:

    $ git log
    commit 8ac8115c3af04bd8f5171452141398b0cfb57f87
    Author: Silvester RÃ¶Ã?ner <silvester.roessner@bosch.com>
    Date:   Wed Jun 29 07:31:46 2016 +0200

        asdf

    commit ae34f23a9a3d7f673ad3ed57dbea5af302d4f0c1
    Author: Silvester Rößner <silvester.roessner@bosch.com>
    Date:   Wed Jun 29 07:31:21 2016 +0200

    test

git log after second amend:

    $ git log
    commit 9240372e8e7336a2c523f27a75b3ac4e07315039
    Author: Silvester RÃ?Â¶Ã??ner <silvester.roessner@bosch.com>
    Date:   Wed Jun 29 07:31:46 2016 +0200

        asdf

    commit ae34f23a9a3d7f673ad3ed57dbea5af302d4f0c1
    Author: Silvester Rößner <silvester.roessner@bosch.com>
    Date:   Wed Jun 29 07:31:21 2016 +0200

        test

To reproduce the bug

    1. create an empty repo,
    2. set up the author name to "Silvester Rößner"
    3. commit a file with git gui
    4. amend the commit with git gui

I use this version

    git-gui version 0.20.GITGUI
    git version 2.9.0.windows.1

    Tcl/Tk version 8.6.5

The versions I used before just work great!

Mit freundlichen Grüßen / Best regards

Silvester Rößner

Automotive Steering, Electric Power Steering Rack, Quality Processes & Engineering (AS-ER/QMM1) Robert Bosch Automotive Steering GmbH | 73527 Schwäbisch Gmünd | GERMANY | www.bosch-automotive-steering.com Tel. +49 7171 31-4120 | Fax +49 7171 31-64120 | silvester.roessner@bosch.com

-- Robert Bosch Automotive Steering GmbH, Richard-Bullinger-Str. 77, 73527 Schwäbisch Gmünd, Germany Vorsitzender des Aufsichtsrats/Chairman of the Supervisory Board: Dirk Hoheisel Geschäftsführung/Management Board: Christian Sobottka (Vorsitz/Chairman), Hanns Bernd Ketteler, Marcus Parche, Henning Wagner Sitz der Gesellschaft/Headquarters: Schwäbisch Gmünd - Handelsregistereintrag: Amtsgericht Ulm HRB 701678/Trade register of the municipal court of Ulm HRB 701678