modal dialog called from QAction does not close until action terminates

[Joachim W]

Under Qt5.9:

A QAction A is connected to a MainWindow member function f that executes a QFileDialog D, then takes quite a while to load the selected files. Against my intentions, the file dialog remains open until f terminates. Calling D.close() does not help. Letting D go out of scope does not help.

My best hypothesis right now is that the unexpected behavior of D in f has to do with f being called from a QAction. Is this plausible, or even a known problem?

[VRonin]

Add QApplication::processEvents(QEventLoop::ExcludeUserInputEvents); after D.close()

[Joachim W]

QApplication::processEvents(QEventLoop::ExcludeUserInputEvents);

has no effect, the problem persists.

Anyway, I was wrong about QAction. The problem also persists if I directly call mainwin->f.

[VRonin]

can you please show your code?

[Joachim W]

What helps is mainwin->repaint().