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bug#62275: closed (28.2; Changing major mode changes the current text sc

From: GNU bug Tracking System
Subject: bug#62275: closed (28.2; Changing major mode changes the current text scaling)
Date: Mon, 20 Mar 2023 17:01:02 +0000

Your message dated Mon, 20 Mar 2023 19:00:37 +0200
with message-id <831qlj8iiy.fsf@gnu.org>
and subject line Re: [External] : Re: bug#62275: 28.2; Changing major mode 
changes the current text scaling
has caused the debbugs.gnu.org bug report #62275,
regarding 28.2; Changing major mode changes the current text scaling
to be marked as done.

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62275: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=62275
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--- Begin Message --- Subject: 28.2; Changing major mode changes the current text scaling Date: Sun, 19 Mar 2023 16:03:26 +0000
Maybe this is intended and documented somewhere - if so, feel free to
close it.  I haven't seen it mentioned, and it doesn't seem right to me.

emacs -Q

Use the mouse (with `C-') or keys to text-scale the buffer, e.g., to
enlarge the text size.

M-x emacs-lisp-mode

The text in the buffer (*scratch*) is resized back to its original size.
Should that happen?  If so, why - is that the right behavior?

In addition, if you then do `M-x lisp-interaction-mode', the text size
doesn't change back to the size you had scaled it to previously.

Text-scaling is per buffer, and the buffer hasn't changed.  Only the
major mode has changed.

I can guess that this is happening because changing the mode kills all
local variables.  But is this the intended behavior, i.e., what we want?
As a user, I find this unexpected (even a bit annoying).  I think users
will (and should) think of text-scaling as per buffer, not something
that's affected by changing the major mode.

I tried doing this, but it didn't fix the behavior.

(put 'text-scale-mode-remapping 'permanent-local t)
(put 'text-scale-mode-lighter 'permanent-local t)
(put 'text-scale-mode-amount 'permanent-local t)

Haven't tried to understand what's really going on - just reporting that
the behavior seems odd to me.

If there's (also) a good use case for the current behavior then maybe we
could have a user option, to choose whether a major-mode change resets
the text scale?

In GNU Emacs 28.2 (build 2, x86_64-w64-mingw32)
 of 2022-09-13 built on AVALON
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:

(NATIVE_COMP present but libgccjit not available)

--- End Message ---
--- Begin Message --- Subject: Re: [External] : Re: bug#62275: 28.2; Changing major mode changes the current text scaling Date: Mon, 20 Mar 2023 19:00:37 +0200
> From: Drew Adams <drew.adams@oracle.com>
> CC: "62275@debbugs.gnu.org" <62275@debbugs.gnu.org>
> Date: Mon, 20 Mar 2023 16:19:22 +0000
> > > > But that's what text-scaling does: it enlarges
> > > > the default face's font.
> > >
> > > You seem to be dancing around this.
> > 
> > Why the sarcasm/insult?  I don't have to have this conversation, and I
> > certainly won't if you keep this attitude.
> There's neither any sarcasm nor any insult there.
> You're apparently seeing what you want to see.
> Why do that?

I definitely wasn't "dancing".

> > > Text-scaling does NOT "customize the default face".
> > 
> > Of course, it does.
> For some meaning of "customize", perhaps.  I didn't
> see any use of any `custom*' functions.  But I may
> not have read the code carefully enough.

Customization in our terminology doesn't necessarily mean one has to
use "M-x customize-SOMETHING".  A simple setq can also be a
customization, as well as some others.

> > Yes, as expected.  Text-scaling, by contrast, is a buffer-local
> > behavior, and buffer-local behaviors get reset when the major mode
> > changes.
> I think you're confirming what I said.  Text-scaling
> doesn't just change face `default' for a given frame.

Text-scaling is a buffer-local change of a face.

> > > These are different things: (1) zooming a buffer
> > > (everywhere) and (2) zooming a frame (all its
> > > windows, whatever the buffers) and zooming
> > > nothing in any other frame.
> > 
> > Not very different, since we now have
> > global-text-scale-adjust and friends.       
> Interesting.  I know nothing about such a command.
> I don't see it in Emacs 28.2 (the latest release).

It's new in Emacs 29.

> Does it zoom all windows (any buffers) in a frame?
> Does it zoom only the current frame?

It affects all faces on all frames.

> At any rate, feel free to close this bug


--- End Message ---

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