[krita] [Bug 473380] XML character reference of non-BMP codepoints in SVG files are truncated

[Alvin Wong]

https://bugs.kde.org/show_bug.cgi?id=473380

--- Comment #8 from Alvin Wong <al...@alvinhc.com> ---
> This is where the truncation happens:
> https://invent.kde.org/qt/qt/qtbase/-/blob/
> 83c69c89fb4495f2fa3d1f302c3aac509fc60313/src/xml/sax/qxml.cpp#L7464-7485
> 
>     stringAddC(QChar(tmp));

And I think the simple fix is to change this to:

    if (Q_LIKELY(!QChar::requiresSurrogates(tmp))) {
        stringAddC(QChar(tmp));
    } else {
        stringAddC(QChar(QChar::highSurrogate(tmp)));
        stringAddC(QChar(QChar::lowSurrogate(tmp)));
    }

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