bug#46397: 27.1; Cannot delete buffer pointing to a file in a path that includes a file

[Matt Armstrong]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Matt Armstrong <gmatta@gmail.com>
>> Cc: 46397@debbugs.gnu.org, eggert@cs.ucla.edu, craven@gmx.net
>> Date: Sat, 13 Feb 2021 16:49:43 -0800
>> 
>> I think auto-save issues messages and warnings, but never prompts
>> ("asks about").
>> 
>> Auto save can call `display-warning' (see auto_save_error in
>> fileio.c) or `message' (see message1() and message_with_string()
>> calls in same). I can't find any prompts.
>> 
>> So let's settle a question before going further. Would you be okay if
>> lock errors were reported in the same way(s) auto-save errors are?
>
> I'm okay with doing the same as auto-save does when Emacs is shutting
> down, yes.  As for other situations, I'm not sure we should just
> display a warning.
>
> Were you asking only about what to do during shutdown?

I have been primarily worried about shutdown, yes.

For non-shutdown, I want to consider errors acquiring and releasing the
lock separately.

When acquiring the lock, I think a prompt is good. The user interaction
I imagine is similar to 'ask-user-about-lock' (steal/proceed/quit), but
might just be (proceed/quit).

When releasing the lock, I have a less clear opinion but I'm thinking
that warnings are better. A warning is still quite intrusive and
obvious. Maybe we don't need to decide this part now.