bug#20598: 25.0.50; Dired: re-use buffers

[Juri Linkov]

>> is there a way to reuse Dired buffers without relying on an external
>> package (in this case: Dired+)?
>>
>> I think it is a handy solution that would make Dired much more pleasant
>> to use.
>
> You could use the dired-find-alternate-file command, bound by default
> to "a".  You can find more information here:
> https://www.emacswiki.org/emacs/DiredReuseDirectoryBuffer
>
> However, "a" does not take care of "^", so maybe it would also be good
> to add a new option to always reuse the current dired buffer?

This is the same as typing "a" on the Dired line with ".."
(although less convenient).