bug#81631: 32.0.50; setting completion-auto-select t when completions-format is 'vertical doesn't returns to the minibuffer when cycling

On Sun, 16 Aug 2026 20:02:07 -0400 Lucas Jimenez <[email protected]> wrote:

> This one it cycled to the minibuffer after last candidate, but then it got
> stucked cycling between the minibuffer and the last candidate not returning to
> the first cycle to cycle all over again.

This sounds like issue (1) mentioned below.  If so, you'll see the same
behavior when completions-format is 'horizontal.  I reported this in
bug#81635 and posted a fix; if you apply that fix as well as the patch I
posted to make cycling through the minibuffer work in vertical format,
then you should get the desired cycling behavior in both horizontal and
vertical formats (unless you hit issue (2), e.g. with `M-x dabbrev- TAB').

>                                           On another instance it cycled, but
> it went like this: last_candidate->minibuffer->closes the minibuffer->opens
> the minibuffer to select first candidate and cycle again.  The difference is
> that in the first I had typed a character to complete and in the later it
> didn’t have anything typed to complete.

I don't quite understand what you're describing.  Can you give a step by
step reproducer with specific input starting emacs with -Q?

Steve Berman


>> On 16-08-2026, at 12:05, Stephen Berman <[email protected]> wrote:
>> 
>> On Sat, 15 Aug 2026 09:10:23 -0400 Lucas Jimenez via "Bug reports for GNU
> Emacs, the Swiss army knife of text editors" <[email protected]
> <mailto:[email protected]>> wrote:
>> 
>>> Hi,
>>> 
>>> Setting completions-format 'vertical and completion-auto-select t
>>> doesn't cycle to the minibuffer when tapping TAB.
>>> 
>>> This behavior is expected since it is the one 'one-column uses and also
>>> 'horizontal
>>> 
>>> Reproduce with:
>>> 
>>> emacs -Q --eval "(setq completions-format 'vertical
>>> completion-auto-select t)"
>> 
>> Thanks for this report; I overlooked this behavior of TAB when I made
>> the changes in 77ca60b48d01.  The attached patch adds this behavior to
>> the vertical format; can you confirm?
>> 
>> However, while testing I noticed two issues: (1) on entering the
>> minibuffer from the *Completions* buffer, typing TAB returns to the last
>> completion candidate rather then going the the first, thus breaking the
>> cycling behavior (likewise for S-TAB); I will file a separate bug report
>> about this and propose a fix.  (2) Navigation through the *Completions*
>> buffer has problems when the completions are annotated (e.g. with key
>> bindings); I haven't debugged this yet but when I do I'll file a
>> separate bug.
>> 
>> Steve Berman