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e9dcfa12c2
When a cached file was closed, --vfs-handle-caching kept its handle and
downloaders alive for a grace period and closed them later from a timer.
The deferred close drops the item lock while tearing down the
downloaders, leaving the file handle open. A reopen landing in that
window saw no grace timer and a live handle, failed to create the cache
file with "internal error: didn't Close file" and removed the cache
file, which hung the application reopening the file.
Reopens now wait for an in-progress grace-period close to finish so they
start from a fully closed item.
See: https://forum.rclone.org/t/opening-a-recently-closed-and-cached-file-hangs-rclone/53986/
(cherry picked from commit 9728fa0ede)