Fixes for Qt 5 / OsX test playback.
With Qt 5, on OsX all file dialog (and other modal dialog) tests would fail. The problem was that the modal dialog's event loop would not quite even after `QDialog::accept()` was called. This happened when `QApplication::processEvents` was called by the testing framework when processing a test item while the modal dialog was open. Skipping the calling of `QApplication::processEvents` overcomes that issue.
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