bug#26973: 26.0.50; sleep-for behavior changes with global-auto-revert-mode enabled

[Paul Eggert]

Andreas Politz wrote:
> For that I used the posted function, added a watch to the /tmp directory
> and noticed that the problematic behavior occured, if any one of those
> flags (open/close/access) were added.

I couldn't reproduce the problem with the current master (commit 288b3ca). That 
is, I ran src/emacs -Q with this:

M-x load-file RET sfp-test.el RET
M-x global-auto-revert-mode RET
M-x start-file-process-test RET
(inotify-add-watch "/tmp" 'open (lambda (event) (message "event %s" event))) 
C-x C-e
M-x start-file-process-test RET

Both instances of start-file-process-test did "process done!" before "sleeping 
done!", which I gather is what is wanted.