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

[Drew Adams]

> >> Currently mouse-wheel-text-scale is bound to C-<mouse-5> and
> >> C-<mouse-4>; could we have an equivalent command for all buffers,
> >> maybe on C-S-<mouse-5> and C-S-<mouse-4>?
> >
> > 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)

That's what frame-zooming does (in zoom-frm.el).
It just zooms in or out on a frame (or all frames).

(To be clear, zoom-frm.el doesn't zoom images etc.
It just affects font size.)