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

[Clément Pit-Claudel]

On 5/9/21 4:43 AM, martin rudalics wrote:
>> 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)