bug#13149: 24.3.50; Emacs thinks file was changed outside Emacs, but it was not

[Drew Adams]

> Debugging this needs running Emacs under a debugger or instrumenting
> the functions involved with special code.  So I guess we are waiting
> for someone else to hit this and offer help.

My crystal ball tells me that others will run into the same problem sooner or
later.  AFAIK, I really don't do anything special that should affect this.  But
my crystal ball has been wrong before.