QFileDialog::getOpenFileName with non-native option can not select a .app on macOS

Only when using non-native dialogs on macOS, there appears to be no way to select a mac application (.app) using QFileDialog::getOpenFileName.

When non-native, that call seems to treat Applications (.app) as normal directories and therefore will *not allow them to be selected.

The native version of this call, properly handles Applications (*.app) as allowing them to be selected.

Unfortunately the non-native version of QFileDialog::getExitingDirectory is not an option here as there appears to be no way to set a name filter to restrict things to .app.

Using native versions of these Dialogs has previously had numerous problems under Qt 5.12.X where some are left hanging around and will not properly close so getting the non-native QFileDialog::getOpenFileName to actually select Applications (.app) as files would be quite useful.