https://bugs.kde.org/show_bug.cgi?id=429408

k...@dickbag.org changed:

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                 CC|                            |k...@dickbag.org

--- Comment #7 from k...@dickbag.org ---
https://code.woboq.org/qt5/qtbase/src/corelib/io/qurlidna.cpp.html#2536

There's your root cause. Bitwise OR of an ASCII character with 0x20 results in
a change to lower case. This appears to be taking place in a unicode-to-ASCII
conversion, which seems to be erroneously converting to lower case as a matter
of course. The previously cited RFC, 3490/3491, obsoleted by 5890/5891, does
make mention of lower case conversions, but strictly in the context of
generating unique DNS labels for hostnames. 

Relevant:
https://www.rfc-editor.org/rfc/rfc5890

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