bug#62540: 30.0.50; incorrect cursor positioning after overlay when put-text-property 'cursor t

[Platon Pronko <platon7pronko@gmail.com>]

According to documentation, if a character in the overlay text string has 'cursor property set to t,
then cursor should be shown on that character while point is in the overlay.

However, it seems that this doesn't work at the moment - cursor is still shown after the overlay.

Here's a test file to reproduce the problem:

```
AD

(defun test-overlay-cursor (completion pt)
   (remove-overlays)
   (save-excursion
     (let* ((p-completion (propertize completion 'face 'error))
            (ov (make-overlay pt pt nil t t)))
       ;; doesn't work, cursor is shown after overlay
       (put-text-property 0 1 'cursor t p-completion)
       ;; works, cursor is shown before overlay
       ;; (put-text-property 0 1 'cursor 1 p-completion)
       (overlay-put ov 'display "")
       (overlay-put ov 'after-string p-completion)))
   (goto-char 2))
(test-overlay-cursor "BC" 2)

```

When I run the last sexp I observe the cusor being shown after the overlay:

ABC<cursor>D

While the expected position is:

A<cursor>BCD

Workaround is to use the integer argument instead of t.


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
  3.24.37, cairo version 1.17.8) of 2023-03-29 built on the-big-maker
Repository revision: 2002ac376c97382cace161ef0832a6faf6f376e8
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Arch Linux

Configured using:
  'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
  --localstatedir=/var --mandir=/usr/share/man --with-gameuser=:games
  --with-modules --without-libotf --without-m17n-flt --without-gconf
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  '--program-transform-name=s/\([ec]tags\)/\1.emacs/'
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Major mode: Lisp Interaction

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   auto-encryption-mode: t
   auto-compression-mode: t

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