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

[Eli Zaretskii]

> Cc: rudalics@gmx.at, 48307@debbugs.gnu.org
> From: Clément Pit-Claudel <cpitclaudel@gmail.com>
> Date: Mon, 10 May 2021 10:53:57 -0400
> 
> (Besides, that's what menu-set-font does

No, it doesn't, at least not here.  My frame is resized when I choose
the same font of a different size.