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    Bug 
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    Resolution: Fixed
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    P2: Important 
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    None
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    5.12.0
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    None
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    Windows 10, Qt 5.12.0 gcc 8.20 mingw 6.0.0
the qdoc might has issue, look at my Qt Widget help, just few classes
build qt from source, qdoc using libclang 7 provided by download.qt.io, shared link and build successfully
make docs and make install_qch_docs successfully.
