Tony Mechelynck wrote:

> RFE: I propose a :noswapfile (or something) prefix, working in similar 
> fashion to the :verbose, :vertical, :top, :tab, etc. prefixes in front 
> of another ex-command, and with the meaning: If that _subordinate_ 
> ex-command opens a new buffer, we want 'noswapfile' set on that buffer. 
> (If it doesn't, nothing happens, as with e.g. :vert :top or :tab when 
> the subordinate command opens no new window.) Or maybe :0swapfile and 
> :1swapfile prefixes.
> 
> Rationale: Currently, “:setlocal noswapfile” prior to opening a new 
> buffer would close the swapfile on the current buffer, not the new one; 
> while doing it afterwards opens and closes a swapfile for the new 
> buffer, which is less harmful but still not ideal.
> 
> In particular, I notice that “directory” windows handled by netrw have 
> swapfiles set on them: IMHO this is wasteful (and after a few crashes 
> you may find yourself with a string of .swp, .swo, .swn, .swm, etc., for 
> something which cannot ever need a recovery).

Makes sense.  An alternative would be an argument along the line of ++bin:
        :sp ++buftype=nofile scratch

Perhaps for netrw it would be
        :sp ++buftype=nowrite dirname

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