bug#29412: 27.0.50; dired-toggle-read-only should (at some point!) check that the direcory is writeable

[Lars Ingebrigtsen]

Juri Linkov <juri@linkov.net> writes:

> OTOH, displaying a warning might go unnoticed by the user.
>
> Then maybe better would be to ask a y-or-n question
> whether the user still wants to edit the unwritable buffer.

Makes sense.  I've now done this change.

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