GNU bug report logs - #45054
27.1; Can get point into the middle of a run of characters with a replacing display spec

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Package: emacs; Reported by: Zack Weinberg <zackw@HIDDEN>; dated Sat, 5 Dec 2020 15:56:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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 (message from Zack Weinberg on Sat, 5 Dec 2020 10:54:57 -0500)
Subject: Re: bug#45054: 27.1;
 Can get point into the middle of a run of characters with a replacing
 display spec
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> From: Zack Weinberg <zackw@HIDDEN>
> Date: Sat, 5 Dec 2020 10:54:57 -0500
> 
> \                    ;; \|
> u00B6                ;; \u00B6|
> C-a                  ;; |\u00B6
> M-x fold-demo-mode   ;; |¶
> C-d                  ;; |u00B6
> \                    ;; ¶|
> x                    ;; \x|u00B6
> 
> The bug happens when you type \ for the second time.  The font-lock rule
> matches again, “\u00B6” is converted to “¶”, and the *visible cursor* is
> displaced to after the “¶”, but *point* is still where it was, between
> the invisible \ and u characters.  Any self-inserting character, like
> the ‘x’ shown in the recipe, will be inserted at the actual location of
> point, instead of the position of the visible cursor.  In the demo, this
> causes the font-lock rule to stop matching again.
> 
> Any cursor-motion command while Emacs is in this state, will put point
> back in sync with the visible cursor; this can lead to odd but harmless
> phenomena, for instance a single C-f doesn’t appear to do anything,
> instead of moving the cursor to the next line like it normally would.
> (Because point moves within the hidden run of characters, and then gets
> displaced to the end of the run, where the visible cursor already is.)
> 
> Questions:
> 
> 1. Is this indeed a bug in Emacs?

Probably a bug in adjust_point_for_property.  Try your recipe after
setting global-disable-point-adjustment non-nil.

> 2. Assuming it is, can you suggest a workaround?  I’m hoping for a
>    viable solution within my code that’s compatible at least as far back
>    as Emacs 24.

A workaround in Lisp?  Try making the affected text, or some of it,
invisible, i.e. give it the 'invisible' text property as well.  (I
didn't try to test this solution, so I cannot promise it will work.)

> 3. I think it would be better UI if the C-d in the recipe deleted the
>    entire run of text that’s getting hidden (more generally, deletion
>    commands should behave as if the ¶ is really what’s in the buffer).
>    I can’t figure out how to implement that, can you suggest anything?

Why can't you delete every character around point that has this
special property?

> 4. Is there a better way to do this sort of visual replacement of runs
>    of text?  This is the first time I’ve done any serious elisp
>    programming, I might have missed something.

Sounds the right way to me (modulo making the text invisible).




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#45054; Package emacs. Full text available.

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Subject: Re: 27.1; Can get point into the middle of a run of characters with a
 replacing display spec
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I forgot to mention that nothing changes if I also have font-lock
apply the 'cursor-intangible property to the hidden run of text.




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Subject: 27.1; Can get point into the middle of a run of characters with a
 replacing display spec
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I'm implementing a minor mode that "folds" certain strings, causing them
to be displayed as the actual single characters that they are notation
for.  For purposes of this bug report, I will use the running example of
displaying C-style backslash escapes for Unicode characters as their
actual characters, e.g. \u00B6 is displayed as =C2=B6 when the mode is
active.

The mode does this by adding a font-lock keywords rule to the buffer,
that applies display properties that make each string look like it's a
single character.  The documentation says that Emacs will not let point
get into the middle of a run of text that's hidden this way, and that's
mostly true, but I found a way to do it.

Starting from =E2=80=98emacs -Q=E2=80=99:

In the *scratch* buffer, evaluate the following minor mode definition;
this is a cut-down version of the real mode, that only replaces \u00B6.

(define-minor-mode fold-demo-mode
  "Folding bug demo"
  :init-value nil
  :lighter " FD"
  :keymap nil
  (make-variable-buffer-local 'font-lock-extra-managed-props)
  (cl-flet ((refontify ()
             (save-excursion
               (goto-char (point-min))
               (while (re-search-forward "\\\\u00[bB]6" nil t)
                 (save-excursion
                   (font-lock-fontify-region
                    (match-beginning 0) (match-end 0)))))))
    (let ((case-fold-search nil)
          (demo-fl-rule '(("\\\\u00[bB]6" 0
                           '(face font-lock-string-face
                                  display "=C2=B6")))))
      (if fold-demo-mode
          (progn
            (push 'display font-lock-extra-managed-props)
            (font-lock-add-keywords nil demo-fl-rule)
            (refontify))
        (font-lock-remove-keywords nil demo-fl-rule)
        (refontify)
        (setq font-lock-extra-managed-props
              (cl-remove 'display font-lock-extra-managed-props
                         :count 1))))))

Then, in any convenient buffer, on an initially blank line, type the
following.  I=E2=80=99ve written the recipe out as it might appear in a
keyboard-macro editing buffer, but instead of command names, the
annotations show what you see at each stage.  The *visible cursor* is
indicated with a |; all other characters are real.

\                    ;; \|
u00B6                ;; \u00B6|
C-a                  ;; |\u00B6
M-x fold-demo-mode   ;; |=C2=B6
C-d                  ;; |u00B6
\                    ;; =C2=B6|
x                    ;; \x|u00B6

The bug happens when you type \ for the second time.  The font-lock rule
matches again, =E2=80=9C\u00B6=E2=80=9D is converted to =E2=80=9C=C2=B6=E2=
=80=9D, and the *visible cursor* is
displaced to after the =E2=80=9C=C2=B6=E2=80=9D, but *point* is still where=
 it was, between
the invisible \ and u characters.  Any self-inserting character, like
the =E2=80=98x=E2=80=99 shown in the recipe, will be inserted at the actual=
 location of
point, instead of the position of the visible cursor.  In the demo, this
causes the font-lock rule to stop matching again.

Any cursor-motion command while Emacs is in this state, will put point
back in sync with the visible cursor; this can lead to odd but harmless
phenomena, for instance a single C-f doesn=E2=80=99t appear to do anything,
instead of moving the cursor to the next line like it normally would.
(Because point moves within the hidden run of characters, and then gets
displaced to the end of the run, where the visible cursor already is.)

Questions:

1. Is this indeed a bug in Emacs?
2. Assuming it is, can you suggest a workaround?  I=E2=80=99m hoping for a
   viable solution within my code that=E2=80=99s compatible at least as far=
 back
   as Emacs 24.

3. I think it would be better UI if the C-d in the recipe deleted the
   entire run of text that=E2=80=99s getting hidden (more generally, deleti=
on
   commands should behave as if the =C2=B6 is really what=E2=80=99s in the =
buffer).
   I can=E2=80=99t figure out how to implement that, can you suggest anythi=
ng?

4. Is there a better way to do this sort of visual replacement of runs
   of text?  This is the first time I=E2=80=99ve done any serious elisp
   programming, I might have missed something.

Thanks for your attention,
zw

In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.23,
cairo version 1.16.0) of 2020-11-07, modified by Debian built on
x86-ubc-01 Windowing system distributor 'The X.Org Foundation', version
11.0.12009000 System Description: Debian GNU/Linux bullseye/sid

Configured using:
 'configure --build x86_64-linux-gnu --prefix=3D/usr
 --sharedstatedir=3D/var/lib --libexecdir=3D/usr/lib
 --localstatedir=3D/var/lib --infodir=3D/usr/share/info
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 --enable-locallisppath=3D/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:=
/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share=
/emacs/site-lisp
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/emacs/site-lisp
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 -fdebug-prefix-map=3D/build/emacs-6jKC2B/emacs-27.1+1=3D.
-fstack-protector-strong -Wformat -Werror=3Dformat-security -Wall'
'CPPFLAGS=3D-Wdate-time -D_FORTIFY_SOURCE=3D2' LDFLAGS=3D-Wl,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
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inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)




Acknowledgement sent to Zack Weinberg <zackw@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#45054; Package emacs. Full text available.
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Last modified: Sat, 5 Dec 2020 16:30:02 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.