Fix: INotifyWatcher keeps watching deleted paths #720
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This PR fixes #709. Full information about the bug are described in the documentation for the
remove_single_descriptormethod.The main problem was, that we tried to remove descriptor from the
inotify.watches(), and, if it was completed successfully, it would be deleted from the hashdescriptor -> path. But after FS entry deletion its file descriptor is invalidated and causes an error, which interrupts deletion from the hash