Timer to find out if app id idle not working as expected

[Cupidvogel]

I tried this in main.cpp of my app:

Application app(argc, argv);
 
IdleTimer *timer = IdleTimer::instance(&app,5);
app.installEventFilter(timer);

Application app(argc, argv);

IdleTimer *timer = IdleTimer::instance(&app,5);
app.installEventFilter(timer);

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Still same result. The debug message always comes 20 seconds after the app launches, no mater what I do, like clicking or moving the mouse.