Emacs 29.1: read-string prompt and other messages in minibuffer

Question

I recently upgraded to Emacs 29.1 from Emacs 26.3.

I primarily use Emacs as a LaTeX document editor. One of the things I do is use loops to select and isolate regions in the buffer for operations. In these loops, I use the read-string function to control the transition from one iteration to the next.

This is an example:

(defun my-function ()
  (interactive)
  (save-excursion
    (let ((enable-recursive-minibuffers t))
      (goto-char (point-min))
      (while (search-forward-regexp "\\\\bibitem" nil t)
    (save-excursion
      (let* ((b (copy-marker (match-beginning 0)))
         (e (copy-marker (progn 
                   (search-forward-regexp 
                    "\\(?:\\\\bibitem\\|\\\\end{thebibliography}\\)" nil t)
                   (match-beginning 0)))))

        (save-restriction
          (narrow-to-region b e)
          (read-string 
           "Make any further manual corrections if necessary and press [ENTER]: "))))))))

(defun it-to-emph ()
  (interactive)
  (query-replace "{\\it " "\\emph{" nil (point-min) (point-max)))

And this is a LaTeX code snippet:

\begin{thebibliography}{99}

\bibitem{Bombelli:1986rw}
L.~Bombelli, R.K.~Koul, J.~Lee and R.D.~Sorkin,
\emph{A Quantum Source of Entropy for Black Holes},
\href{https://doi.org/10.1103/PhysRevD.34.373}{\emph{Phys. Rev. D} {\bfseries 34} (1986) 373}.


\bibitem{Srednicki:1993im}
M.~Srednicki,
{\it Entropy and area},
\href{https://doi.org/10.1103/PhysRevLett.71.666}{\emph{Phys. Rev. Lett.} {\bfseries 71} (1993) 666}
[\href{https://arxiv.org/abs/hep-th/9303048}{{\ttfamily hep-th/9303048}}].


\bibitem{Holzhey:1994we}
C.~Holzhey, F.~Larsen and F.~Wilczek,
{\it Geometric and renormalized entropy in conformal field theory},
\href{https://doi.org/10.1016/0550-3213(94)90402-2}{\emph{Nucl. Phys. B} {\bfseries 424} (1994) 443}
[\href{https://arxiv.org/abs/hep-th/9403108}{{\ttfamily hep-th/9403108}}].

\end{thebibliography}

I have noticed that in previous versions of Emacs, any messages temporarily overlaid the read-string prompt in the minibuffer.

Emacs 26.3 (Look at the "Replaced 1 occurrence" message)

However, in Emacs 29.1, messages are displayed alongside the read-string prompt.

Emacs 29.1 (Look at the "Replaced 1 occurrence" message)

1. Is there a way to restore the behavior of previous versions?
2. Is read-string the wrong function to be used for this purpose?

Note. The same thing happens with the prompt of query-replace.

Answer 1

emacs-27 introduced set-message-function to call set-message-functions, which by default appends the message to the prompt. To get back the emacs-26 behaviour, set or let-bind set-message-function to nil.