bug#73387: 30.0.90; C-x v v in diff-mode doesn't work after C-c C-n

[Sean Whitton <spwhitton@spwhitton.name>]

Hello,

On Fri 27 Sep 2024 at 10:13pm +03, Dmitry Gutov wrote:

>> What do you think about this:
>> - add a command which does the kill-all-but-this-hunk (or hunks in
>>    region if mark active) thing -- it's generally useful.
>> - make C-x v v on a narrowed buffer, by default, issue a message saying
>>    "Cannot commit patch when narrowed, consider <binding of new command>"
>
> Or it would implement that previous alternative - using the modified buffer
> string that's limited to the current narrowing.
>
> I'm somewhat concerned about supporting both approaches (how different are the
> code paths going to be?), but if that's needed for usability, perhaps it's
> okay.

Hmm, I thought that we thought the modified buffer string approach was
too messy.  Would you mind outlining your proposal as a whole and how it
differs from my most recent one?

>> - add a user option that when non-nil means C-x v v on a narrowed buffer
>>    automatically widens, invokes the new command, and then commits.
>
> And/or Emacs could by default prompt whether it should do that. And that
> prompting behavior could indeed be decided by a user option.
>
>> My thinking is that the latter behaviour is complex and so shouldn't be
>> the default, but once you understand what's going on then there is a
>> good chance you want to enable it.
>
> Maybe if the prompt is easy enough to understand, that will be fine...

Yeah.

-- 
Sean Whitton