The Inotify accelerated filesystem monitor may lose acceleration in some cases.
Imported from https://youtrack.roxen.com/issue/PIKE-16
Reported by @grubba
The MacOS X Finder is apparently fond of the access pattern when copying files:
graph LR C1[Create]==>Delete Delete==>C2[Create]
The monitor for the resulting file may get lost if the second create comes before the parent directory has been scanned.