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mousePressEvent doesn't get called when left mouse button clicked

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However it does get called when right or middle mouse button is clicked. Does any one know what’s wrong? void MyWindow::mousePressEvent(QMouseEvent *event) {     if(event->button() == Qt::LeftButton)         std::cout << "left mouse click " << std::endl;   // doesn't work     else if (event->button() == Qt::RightButton)         std::cout << "right mouse click " << std::endl;  // does work     else if (event->button() == Qt::MidButton)         std::cout << "middle mouse click " << std::endl;   /// does work }

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