bug#61850: 29.0.60; Emacs 29 removes the ability to suppress ediff frames

bug#61850: 29.0.60; Emacs 29 removes the ability to suppress ediff frames

[Morgan Willcock]

It no longer seems possible to prevent ediff creating additional frames.
Previously this behaviour could be altered with:

  (advice-add 'ediff-window-display-p :override #'ignore)

This no longer seems to work, I imagine because this functions is now an
alias:

  (define-obsolete-function-alias 'ediff-window-display-p #'display-graphic-p "29.1")

The problems caused by opening an additional frame do not necessarily
correspond with the result of display-graphic-p. For example, when using
EXWM a frame is a workspace and creating a new workspace is unlikely to
be desirable or usable within an ediff session.

If ediff-window-display-p is obsolete I think there needs to be a custom
variable added to allow users to suppress the creation of new frames by
ediff.

Thanks,
Morgan


In GNU Emacs 29.0.60 (build 1, x86_64-w64-mingw32) of 2023-02-19 built
 on AVALON
Repository revision: 497ed0fb42e90b9f1815b520fc632a2f70eb43e1
Repository branch: emacs-29
Windowing system distributor 'Microsoft Corp.', version 10.0.19044
System Description: Microsoft Windows 10 Pro (v10.0.2009.19044.2604)

Configured using:
 'configure --with-modules --without-dbus --with-native-compilation
 --without-compress-install CFLAGS=-O2'

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS WEBP XPM ZLIB

(NATIVE_COMP present but libgccjit not available)

Important settings:
  value of $LANG: ENG
  locale-coding-system: cp1252

Major mode: ELisp/l

Minor modes in effect:
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  server-mode: t
  display-fill-column-indicator-mode: t
  vertico-multiform-mode: t
  vertico-flat-mode: t
  vertico-mode: t
  global-corfu-mode: t
  corfu-mode: t
  which-key-mode: t
  erc-spelling-mode: t
  savehist-mode: t
  minibuffer-electric-default-mode: t
  minibuffer-depth-indicate-mode: t
  recentf-mode: t
  shell-dirtrack-mode: t
  global-hl-line-mode: t
  display-time-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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Features:
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tramp-sh tramp tramp-loaddefs trampver tramp-integration cus-edit
cus-start cus-load files-x tramp-compat sort mm-archive mail-extr
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Memory information:
((conses 16 1660441 112217)
 (symbols 48 49094 8)
 (strings 32 349337 12805)
 (string-bytes 1 9312025)
 (vectors 16 135921)
 (vector-slots 8 2512230 136946)
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bug#61850: 29.0.60; Emacs 29 removes the ability to suppress ediff frames

[Eli Zaretskii]

> From: Morgan Willcock <morgan@ice9.digital>
> Date: Mon, 27 Feb 2023 12:32:52 +0000
> 
> If ediff-window-display-p is obsolete I think there needs to be a custom
> variable added to allow users to suppress the creation of new frames by
> ediff.

I agree.  Would you like to submit a patch to that effect?

bug#61850: 29.0.60; Emacs 29 removes the ability to suppress ediff frames

[Daniel Martín via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Morgan Willcock <morgan@ice9.digital> writes:

> It no longer seems possible to prevent ediff creating additional frames.
> Previously this behaviour could be altered with:
>
>   (advice-add 'ediff-window-display-p :override #'ignore)
>
> This no longer seems to work, I imagine because this functions is now an
> alias:
>
>   (define-obsolete-function-alias 'ediff-window-display-p #'display-graphic-p "29.1")
>
> The problems caused by opening an additional frame do not necessarily
> correspond with the result of display-graphic-p. For example, when using
> EXWM a frame is a workspace and creating a new workspace is unlikely to
> be desirable or usable within an ediff session.
>
> If ediff-window-display-p is obsolete I think there needs to be a custom
> variable added to allow users to suppress the creation of new frames by
> ediff.

I think the supported way to make Ediff work in a single frame is the
following:

(setq ediff-window-setup-function 'ediff-setup-windows-plain)

bug#61850: 29.0.60; Emacs 29 removes the ability to suppress ediff frames

[Morgan Willcock]

Daniel Martín <mardani29@yahoo.es> writes:

> I think the supported way to make Ediff work in a single frame is the
> following:
>
> (setq ediff-window-setup-function 'ediff-setup-windows-plain)

You are absolutely correct.  I went looking for where to add an option
and have just found the same variable, which works with no issues.

Apologies for the noise.

bug#61850: 29.0.60; Emacs 29 removes the ability to suppress ediff frames

[Daniel Martín via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Morgan Willcock <morgan@ice9.digital> writes:

> Daniel Martín <mardani29@yahoo.es> writes:
>
>> I think the supported way to make Ediff work in a single frame is the
>> following:
>>
>> (setq ediff-window-setup-function 'ediff-setup-windows-plain)
>
> You are absolutely correct.  I went looking for where to add an option
> and have just found the same variable, which works with no issues.
>
> Apologies for the noise.

No worries, I'm closing this bug, then.