bug#2833: 23.0.92; Bug in Directory Variables

[David De La Harpe Golden]

Chong Yidong wrote:
> The following patch changes the directory local variables code so that
> the cache stores the file atime.  Before using each cache entry, we
> check that against the file modtime.
>
> This is not an ideal time to make changes of this sort, but I think this
> problem (i.e., inability to detect changes in .dir-locals.el files) is
> quite a serious one.  So please help me review this patch.

I suspect the systems where a problem with the patch will be most 
noticeable will be windoze, since there's an extra file attributes call? 
 I have a suspicion you almost might as well abandon the caching given 
the scary timings we've seen for that in the past.  I could be wrong though.