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:

>> There is also the case where 'kill_emacs' is called from a signal,
>> which
[...]
> But we do ask about auto-save errors in these cases, don't we?  If so,
> why not ask about locks as well?

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 should reveal: during shut down, both `message' and `display-warning'
seems to have no effect. The first thing `shut_down_emacs()' does is
inhibit display, which is probably why.

Taking this approach would be a tremendous simplification over what I
had been thiking you were asking for. Most of my confusion centers
around re-aranging code flow such that all possible errors occur, by
construction, only *before* shut_down_emacs() may be called.