bug#70577: [PATCH] New command other-project-prefix

[Juri Linkov <juri@linkov.net>]

> We would want 'C-h' to show the regular buffer with key bindings, won't we?
> With similar output to the one that we get after 'C-x p C-h' or 'C-x
> v C-h'. The output might be weirder because of the composed keymap, but it
> could still be useful.

Then maybe something like

  (define-key map (vector help-char)
              (lambda () (interactive) (describe-bindings)))

or

  (define-key map (vector help-char)
              (lambda () (interactive) (describe-keymap (cons 'keymap (current-active-maps)))))

or

  (define-key map (vector help-char)
              (lambda () (interactive) (describe-keymap (cons 'keymap project-prefix-map))))

>> However, a much bigger problem is that unfortunately many test cases from
>> https://debbugs.gnu.org/63648#203 are broken.  For example,
>> 'C-x p p C-b' fails the same way as in bug#58784.
>> 'C-x p p f M-n' fails because it expects to read arguments
>> in a previous project with an old value of default-directory, etc.
>
> Thanks for noticing. Looks like the call to project-prompter can change the
> value of this-command, and that's why the subsequent check went down the
> wrong branch. See the attached v3 with the fix.

Wow, everything works now, will test more as a primary 'C-x p p' command.