Bug#855482: audacity: data lost when saved (but still opened) project is removed

[Reiner Herrmann]

Package: audacity
Version: 2.1.2-2
Tags: upstream

Dear maintainer,

I noticed that Audacity loses recorded audio when a saved project is removed from
the filesystem, even though it is still open.
It happened to me when I wanted to export something as an audio file, but accidentally saved
the Audacity project. So I removed it again, and tried to export it again.
I would expect that this still succeeds, as the project is still opened and the data should
still be in memory; and it also still displayed the waveform of the tracks.

To reproduce:
- Record something.
- File -> Save Project
  (Until now playing back the recording or exporting it is still working fine.)
- Remove the recorded project again from the filesystem (but keep Audacity open).
  The track/waveform is now still visible in Audacity, but when played back, it only plays silence.
  When trying to export the audio, the file (e.g. wav) has the correct length (the same as in the
  recording), but contains only silence.

Kind regards,
  Reiner
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