bug#18141: 24.4.50; saving .gz file breaks file coding

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: rgm@gnu.org,  18141@debbugs.gnu.org,  vincent@vinc17.net,  yamaoka@jpl.org
> Date: Thu, 07 Aug 2014 16:43:05 -0400
> 
> > I think users generally expect this to be a transaction.  And at least
> > on Posix platforms, where rename is an atomic operation, we can
> > achieve this, or come pretty close.
> 
> I think the time-window is inevitable as long as we do "move first, then
> write the new file".  Of course, we could do it the "precious"
> way instead (i.e. write the new file first and then do the needed
> link&unlink to move it into place).

Yes, I meant the latter method.