bug#42039: 27.0.91; (posn-x-y (posn-at-point)) inconsistent with display-line-numbers-mode

[Dmitry Gutov <dgutov@yandex.ru>]

On 26.06.2020 15:04, Eli Zaretskii wrote:
>> From: Dmitry Gutov <dgutov@yandex.ru>
>> Date: Thu, 25 Jun 2020 16:29:21 +0300
>>
>> 1. Enable display-line-numbers-mode.
>> 2. Move point to the beginning of some line.
>> 3. Evaluate (posn-x-y (posn-at-point))
>>
>> => The value in CAR will be > 0 (to account for the columns taken by
>> d-l-n-m).
>>
>> 4. Do the same thing on a line that belongs to an overlay. For example,
>> the overlay in the bug reporting buffer (move point to the line with
>> "This bug report...").
>> 5. The return value will be like (0 . 180).
>>
>> The expected behavior: the column should still account for the offset by
>> the d-l-n-m.
>>
>> I'd really like to see this fixed in Emacs, it makes positioning of
>> popups unpredictable when display-line-numbers-mode is enabled:
>> https://github.com/company-mode/company-quickhelp/issues/106
> 
> Your wish has been granted: this should now be fixed on the emacs-27
> branch.

Thank you.

It's working fine now in the cases I really care about (so we can close 
the report), but here's one you seem to have missed:

1. M-x report-emacs-bug.
2. Toggle display-line-numbers-mode on.
3. Move point to the second display string ("If Emacs crashed...").
4. Evaluate (posn-x-y (posn-at-point)).