bug#62275: 28.2; Changing major mode changes the current text scaling

[Eli Zaretskii <eliz@gnu.org>]

> 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

Done.