https://bugreports.qt.io/browse/QTBUG-53315
> On May 10, 2016, at 11:51 AM, John Weeks <j...@wavemetrics.com> wrote:
>
> The very simple application posted below (it is a complete runnable example)
> creates a window that puts up a menu on clicking in the window. If you select
> "Open File..." it then puts up a QFileDialog to choose a file. Upon
> returning, the window no longer appears to active. Experience with our real
> application where we observe this behavior suggests that Qt thinks the window
> is still active, but OS X does not. This causes other strange problems.
>
> Application works as expected on Windows.
>
> I am inclined to believe this is a Qt bug. But I would be interested to know
> what others think, and if you might know of a work-around.
>
> Thanks!
>
> -John Weeks
>
> #include <QApplication>
> #include <QMainWindow>
> #include <QMouseEvent>
> #include <QFileDialog>
> #include <QString>
> #include <QDebug>
> #include <QMenu>
> #include <QAction>
>
> class MainWindow : public QMainWindow
> {
> public:
> explicit MainWindow(QWidget *parent = 0);
> ~MainWindow();
>
> protected:
> void mouseReleaseEvent(QMouseEvent * event);
>
> private:
> };
>
> MainWindow::MainWindow(QWidget *parent) :
> QMainWindow(parent)
> {
> }
>
> MainWindow::~MainWindow()
> {
> }
>
> void MainWindow::mouseReleaseEvent(QMouseEvent * event)
> {
> QMenu menu;
> menu.addAction("Open File...");
> QAction * selectedAction = menu.exec(event->globalPos());
>
> if (selectedAction)
> {
> QFileDialog::Options options = 0;
> // options |= QFileDialog::DontUseNativeDialog;
> QString fullQtPath = QFileDialog::getOpenFileName(NULL,
> QStringLiteral("Dialog Caption"), QString(), QString(), nullptr, options);
> qDebug() << fullQtPath;
> }
> }
>
> int main(int argc, char *argv[])
> {
> QApplication a(argc, argv);
> MainWindow w;
> w.show();
>
> return a.exec();
> }
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