bug#39484: 26.3; try-completion bug

[Lars Ingebrigtsen]

Andreas Schwab <schwab@linux-m68k.org> writes:

> On Okt 27 2020, Wanrong Lin wrote:
>
>> The answer is not bad, matching at least one of the candidates. That makes
>> the answer to my original example even more odd:
>> (let ((completion-ignore-case t))
>>        (try-completion "xyz" '("XyzD" "XyzAbc"))
>>        )
>> ==> "xyz"
>
> That also matches one of the candidates (since case doesn't matter).

It does, but it's weird.  I mean, this pair of return values don't make
sense on any level:

(let ((completion-ignore-case t))
  (try-completion "xyz" '("XyzaD" "XyZabc")))
=> "Xyza"

(let ((completion-ignore-case t))
  (try-completion "xyz" '("XyZbD" "XyZabc")))
=> "xyz"  

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