bug#58447: [PATCH] In project-find-file, add absolute file name to history

[Juri Linkov]

> The patches could be combined, but v1 seems to be too invasive for
> emacs-29, yet v2 could be just small enough to be considered "bugfix-only".
>
> So, what does everyone think about the latter?
>
> If people agree that the v2 patch is an improvement, we can check it in and
> leave project-local histories until later.

Does the second patch allow such workflows as re-visiting
the same relative filenames in another directory?

IMHO, the safest fix for emacs-29 would be to add relative filenames
to the separate history.  If someone might want to use
'file-name-history', then a new variable could be added like
'query-replace-from-history-variable'.  Then this variable
could be customized to 'file-name-history', or nil.

It's needed only when 'project-read-file-name-function'
is 'project--read-file-cpd-relative'.

But please also note that its value 'project--read-file-absolute'
is also broken.  It asks confirmation for re-visiting even absolute
filenames, because currently 'C-x p f' adds abbreviated filenames,
but confirmation checks for absolute.