Meaning of eventFilter return value
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General and Desktop
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@IknowQT It's explained in the documentation: https://doc.qt.io/qt-5/qobject.html#installEventFilter
"The eventFilter() function must return true if the event should be filtered, (i.e. stopped); otherwise it must return false."
So, if you return true it means the event is droped and the object (on which you set the event filter) will not handle it.