Revision Graph crashes if the log message is written in Japanese

I found a bug on Revision Graph.
It crashes when showing the log message which is written in Japanese.

The crash happens at the below code in CRevisionGraphWnd::OnToolTipNotify.
        if (rentry->tagNames.empty())
        {
            strTipText.Format(IDS_REVGRAPH_BOXTOOLTIP,
                                            rentry->revision,
                                            rentry->realPath.GetPath().c_str(),
                                            revisionInfo.GetAuthor(index),
                                            date,
                                            revisionInfo.GetComment(index).c_str());
        }

At the time, revisionInfo.GetComment(index).c_str() is an endless string,
It has no \0 termination.

And I attach a repository dumpfile which can reproduce the crash.
If you move the mouse cursor to revision 1, "Revision Graph" crashes.

Regards.
Masaru.

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