Use Q_EMIT instead of emit
In C++20 there are new classes that have member functions named emit(). c.f.: https://lists.qt-project.org/pipermail/development/2020-February/038812.html https://en.cppreference.com/w/cpp/io/basic_osyncstream/emit
A similar change was done in the KDE Frameworks: frameworks/kio!315 (merged)
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