In some situations emacs does not catch the case that edited file changed on disk. Typical example: 1. create some file under cvs, edit it in emacs, save to disk 2. in shell (not in emacs) do cvs commit command, the file is changed ($Id$ expanded to current version) 3. Try to continue editing the file in emacs, emacs say "the file was changed on disk, ..." and this is the correct behaviour. The problem: quite seldom (typically in 1 out of 100 tries) instead of correct #3 emacs allows editing changed file without any warning. This looks like some kind a race, which is hard for me to reproduce deterministically. The described problem do exists in emacs-24.1-7, emacs-23, emacs-22 and probably emacs-21.
Also, when the race occur, the emacs continue to show old CVS version. example: I edited version 1.21 , emacs show 1.21 in shell (not in emacs) I did commit , the version became 1.22 emacs, when the race occurred, still show the version is 1.21 and allows editing the file without warning and suggestion to re-read.
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This should be solved in next emacs version 24.5. If not please reopen bug again.
I just tried emacs-24.5-1 from Rawhide, recompiled on F17. emacs-24.5-1.fc17.x86_64 Same thing when using CVS commit from shell. In one out of 5-6 times it fails to notice file change.
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