Isn't this a bug?
bool QCocoaWindow::isTransitioningToFullScreen() const
{
NSWindow *window = m_view.window;
return window.styleMask & NSWindowStyleMaskFullScreen && !window.qt_fullScreen;
}
Seems like the bitwise & needs parens.
This is from Qt 5.12.9. Haven't checked Qt 5.15.
-John Weeks
WaveMetrics, Inc.