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

[Eli Zaretskii]

> Date: Sun, 09 May 2021 22:56:34 +0000
> From: Gregory Heytings <gregory@heytings.org>
> Cc: 48307@debbugs.gnu.org
> 
> > There's something more subtle happening, because using text-scale-adjust 
> > is much faster, even on a frame with a single buffer.
> 
> Again I don't know, but I don't think so.  AFAICS it's faster because 
> redisplaying a single buffer without changing the window and frame size is 
> faster than redisplaying all buffers in a frame and resizing the frame 
> itself.

Enlarging the frame means we also interact with the WM and await its
response, no?