DiffBlamesWithTortoiseMerge

I noticed that CAppUtils::StartExtDiff function reads undocumented
DiffBlamesWithTortoiseMerge registry flag.
It's apparent effect is to disable external diff tools and always use
TortoiseMerge instead.
This, however, is not quite what the name implies, so I suspect this is a bug.
To fix it, I need to know what this setting is intended to do ;-)

Perhaps
        bool bUseTMerge = !!(DWORD)blamediff;
should read
        bool bUseTMerge = bBlame && !!(DWORD)blamediff;
?

-- 
Alexander S. Klenin
Insight Experts Ltd.
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