bug#60285: xref-query-replace-in-results could show an arrow pointing to the current item being replaced

[Dmitry Gutov <dgutov@yandex.ru>]

On 01/01/2023 13:23, Daniel Martín wrote:
> Dmitry Gutov<dgutov@yandex.ru>  writes:
> 
>> On 23/12/2022 21:16, Daniel Martín via Bug reports for GNU Emacs, the
>> Swiss army knife of text editors wrote:
>>> Severity: wishlist
>>> When you use xref-query-replace-in-results to replace some
>>> references,
>>> it'd be great if the xref buffer showed an overlay arrow (see
>>> xref--set-arrow) pointing to the reference being edited.  That'd give
>>> better context about the reference that is being edited and the global
>>> progress of the query replace operation.
>> SGTM.
>>
>> Here's a patch which seems to work. It's a little tricky, though, and
>> I'm at a loss with better variable names in some places.
>>
>> Wish we had some unit tests here.
> Thanks.  It works well, but there are some corner cases.

Thanks for testing.

> For example,
> as you can undo or go to the previous match during the query replace,
> the arrow should point to the previous result, if possible.

Hmm, I'm not sure how to implement that. Some new hook inside 
perform-replace?

Maybe Juri has some ideas.