bug#59381: Should xref--marker-ring be per-window?

[Juri Linkov]

>>> What does everyone think if we do the baseline of just creating a new
>>> stack per-window (no copying) and then waiting to see if we get
>>> feedback once people start using it?
>> If this is optional and can be disabled, I don't think I mind.
>
> Definitely optional, we should provide different "storages" for
> this. Global (the current behavior), per-window, per-frame, maybe others.

Also per-project (maybe even by default).

PS: this whole subject of different xref stacks reminds me
trying to make sense of the different next-error stacks ;-)