Git: Show commit on double-click in fixup editor

Change-Id: I8cb08b0fcba3ddac7223b39b3762ff71e8d61f8c
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/git/gitsubmiteditorwidget.h

@@ -72,6 +72,9 @@ protected:
     bool canSubmit() const;
     QString cleanupDescription(const QString &) const;
 
+signals:
+    void show(const QString &commit);
+
 private slots:
     void authorInformationChanged();