Subject: bug#48307: Feature request: provide default keybindings to change the font size in all windows

From: martin rudalics <[email-masked]>
Date: Mon, 10 May 2021 10:24:08 +0200

>> I suppose you mean a command for all _frames_.  Any buffer-local text
 >> scaling would still override that.
 >
 > Sure: I meant something that scales the font in every window (and
 > possibly in every frame, too, indeed)

There is one subtle difference you should be aware of:

(1) If you change the size of the default font of a live frame, that
     frame's size may change unless you rule out implied resizing for it.

(2) If you change the font in all windows showing a buffer by adjusting
     that buffer's text scaling, frame sizes will stay the same.

So you have to be precise about the "something that scales" you want.

martin