Jonas Jenwald 22cb59e7d0 Wait until saving has finished before resetting PDFViewerApplication._saveInProgress (PR 12137 follow-up)
I obviously missed this during review, but currently `PDFViewerApplication._saveInProgress` is reset *synchronously* in `PDFViewerApplication.save`.
That was probably not intended, since it essentially renders the `PDFViewerApplication._saveInProgress` check pointless given that the actual saving is an *asynchronous* operation.
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