Ben Fritz wrote:

> On Friday, June 2, 2017 at 3:36:40 PM UTC-5, kwizzz wrote:
> > I am having troubles with vim (8.0.586 and 7.4 downloaded from www.vim.org) 
> > on Windows 7.
> > 
> > There seems to be a time stamp issue with swap files where swap files will 
> > not
> > 
> > get removed after closing vim with swap files being 1 second newer than 
> > saved
> > 
> > file; when trying to edit the file later, vim will complain with swap 
> > exists.
> > 
> > Steps to reproduce behaviour:
> > 
> > open a file (it does not matter if it exists or not) => vim will create
> > 
> > corresponding swp file
> > do a short editing session (only a few (~4) seconds, not too long) and
> > 
> > immediately save and close it => swp file stays in file system in about 10%
> > 
> > (with a higher chance if hidden is set)
> > 
> > 
> > Behaviour can be reproduced with a higher probability, if you open vim with 
> > a
> > 
> > file, do a :vimgrep/./* over about 20 or more text files in the folder,
> > 
> > randomly navigate through the findings (:cn & co) and close vim => some
> > 
> > opened (sometimes even simply grepped) files leave swap files.
> > 
> > Tried vim -u NONE with same behaviour.
> > 
> > Please let me know what to do to provide more information to you, as I am
> > 
> > somewhat lost here...
> > 
> 
> It could be a virus scanner preventing Vim from deleting the file if it has 
> it open for scanning.
> 
> It also could be a problem with a network share (you didn't say if any 
> particular location is affected).
> 
> You could try experimenting with the 'directory' option to place all your 
> swap files in a different local folder, especially if you can put that folder 
> in a virus scanner whitelist.

If you are using a FAT file system (quite old now, but still exists on
some media): It has a write timestamp resolution of 2 seconds.  The
round-off error can cause problems.

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