The planner marked a drawing as autosaved when it dispatched the write, and the background
worker only logged a failure. An unchanged drawing whose write failed was then never written
again, even once the folder became writable. The worker now reports whether the file was
written; on a failure (or a thread that could not be spawned) the drawing is no longer counted as
autosaved, so the next plan restarts its SAVETIME clock and tries again.
Marco Arnulfo
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