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Cleanup of failed download may misbehave #157
Description
Sometimes if a download fails, the subsequent cleanup of the project directory may fail as well: MerginMaps/qgis-plugin#442 (comment)
While it looks like some other app is using the downloaded files, it is possible that we are doing the cleanup too early - e.g. in download_project_is_running() we do the cleanup while some other futures may be still active: we should wait until all jobs are done before doing any cleanup.
Activity
wait for all futures before performing cleanup (fix #157)
wait until all active futures complete and cancel all pending futures
wait for all futures before performing cleanup (refs #157)
wait for all futures before performing cleanup (refs #157)