bug#20076: 24.4; x-nontext-pointer-shape not existent as option from Lisp code

bug#20076: 24.4; x-nontext-pointer-shape not existent as option from Lisp code

[Vasilij Schneidermann]

I've attempted to customize the shape of the pointer for the current
frame, what I've found out so far is that there are a text property to
change the pointer shape when hovering over it and the `x-pointer-shape'
option which takes effect on hovering over text.  Looking at the xfns.c
file in the Emacs 24.4 sources revealed to me that there is a
`x-nontext-pointer-shape' option which is processed similiarly to the
`x-pointer-shape' option, however the code responsible for exposing it
in the Lisp code is commented out with a preprocessor directive.

Is there any particular reason for this peculiar decision?  Or more
generally, why would a desirable feature be present, but commented out
from code?  Are there any special known caveats that led to it?



In GNU Emacs 24.4.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.14.7)
 of 2015-01-17 on bisson
Windowing system distributor `The X.Org Foundation', version 11.0.11701000
System Description:	Arch Linux

Configured using:
 `configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
 --param=ssp-buffer-size=4' CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Org

Minor modes in effect:
  org-indent-mode: t
  remember-notes-mode: t
  yas-minor-mode: t
  show-smartparens-mode: t
  smartparens-mode: t
  goto-address-mode: t
  company-quickhelp-mode: t
  eyebrowse-mode: t
  global-surround-mode: t
  surround-mode: t
  evil-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  evil-local-mode: t
  which-function-mode: t
  helm-mode: t
  shell-dirtrack-mode: t
  helm-match-plugin-mode: t
  helm-occur-match-plugin-mode: t
  shackle-mode: t
  winner-mode: t
  savehist-mode: t
  recentf-mode: t
  circe-lagmon-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  auto-fill-function: org-auto-fill-function
  transient-mark-mode: t

Recent input:
M-x r e p o r t - e m a c s <return>

Recent messages:
ad-handle-definition: `tramp-read-passwd' got redefined
Helm completion enabled
ad-handle-definition: `evil-mode' got redefined
[yas] Prepared just-in-time loading for ~/.emacs.d/snippets
[yas] Reloaded everything (snippets will load just-in-time)....
Let the hacking begin!
[yas] Loading for `org-mode', just-in-time: (lambda nil (yas--load-directory-1 (quote /home/wasa/.emacs.d/snippets/org-mode) (quote org-mode)))!
[yas] Loading compiled snippets from /home/wasa/.emacs.d/snippets/org-mode
[yas] Loading for `text-mode', just-in-time: (lambda nil (yas--load-directory-1 (quote /home/wasa/.emacs.d/snippets/text-mode) (quote text-mode)))!
[yas] Loading compiled snippets from /home/wasa/.emacs.d/snippets/text-mode

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/home/wasa/.emacs.d/elpa/org-20141020/ob-java hides /usr/share/emacs/24.4/lisp/org/ob-java
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/home/wasa/.emacs.d/elpa/org-20141020/org-capture hides /usr/share/emacs/24.4/lisp/org/org-capture
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/home/wasa/.emacs.d/elpa/org-20141020/ob-org hides /usr/share/emacs/24.4/lisp/org/ob-org
/home/wasa/.emacs.d/elpa/org-20141020/org-agenda hides /usr/share/emacs/24.4/lisp/org/org-agenda
/home/wasa/.emacs.d/elpa/org-20141020/ob-io hides /usr/share/emacs/24.4/lisp/org/ob-io
/home/wasa/.emacs.d/elpa/org-20141020/org-element hides /usr/share/emacs/24.4/lisp/org/org-element
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/home/wasa/.emacs.d/elpa/org-20141020/ox-odt hides /usr/share/emacs/24.4/lisp/org/ox-odt
/home/wasa/.emacs.d/elpa/org-20141020/org-clock hides /usr/share/emacs/24.4/lisp/org/org-clock
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/home/wasa/.emacs.d/elpa/org-20141020/ob-makefile hides /usr/share/emacs/24.4/lisp/org/ob-makefile
/home/wasa/.emacs.d/elpa/org-20141020/org-eshell hides /usr/share/emacs/24.4/lisp/org/org-eshell
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bug#20076: 24.4; x-nontext-pointer-shape not existent as option from Lisp code

[Noam Postavsky]

Vasilij Schneidermann <v.schneidermann@gmail.com> writes:

> I've attempted to customize the shape of the pointer for the current
> frame, what I've found out so far is that there are a text property to
> change the pointer shape when hovering over it and the `x-pointer-shape'
> option which takes effect on hovering over text.  Looking at the xfns.c
> file in the Emacs 24.4 sources revealed to me that there is a
> `x-nontext-pointer-shape' option which is processed similiarly to the
> `x-pointer-shape' option, however the code responsible for exposing it
> in the Lisp code is commented out with a preprocessor directive.
>
> Is there any particular reason for this peculiar decision?  Or more
> generally, why would a desirable feature be present, but commented out
> from code?  Are there any special known caveats that led to it?

I think the reasons are lost to the mist of time, [1: af01ef2643] is the commit
which ifdefs it out; the changelog is not very enlightening.

[1: af01ef2643]: 1993-05-21 20:22:10 +0000
  (syms_of_xfns): Don't make Lisp vars x-mode-pointer-shape and x-nontext-pointer-shape.
  https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=af01ef26430d69c04421aac4d862df4f5898a838

bug#20076: 24.4; x-nontext-pointer-shape not existent as option from Lisp code

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@gmail.com>
> Date: Sun, 12 Aug 2018 20:05:32 -0400
> Cc: 20076@debbugs.gnu.org
> 
> > Is there any particular reason for this peculiar decision?  Or more
> > generally, why would a desirable feature be present, but commented out
> > from code?  Are there any special known caveats that led to it?
> 
> I think the reasons are lost to the mist of time, [1: af01ef2643] is the commit
> which ifdefs it out; the changelog is not very enlightening.
> 
> [1: af01ef2643]: 1993-05-21 20:22:10 +0000
>   (syms_of_xfns): Don't make Lisp vars x-mode-pointer-shape and x-nontext-pointer-shape.
>   https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=af01ef26430d69c04421aac4d862df4f5898a838

We could perhaps expose these variables to Lisp again, on master, and
see if that breaks something in the long run.