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

[Gregory Heytings]

Thanks for mentioning frame-inhibit-implied-resize, I did not know it 
exists.

I attach a patch that does, I believe, what Clément has in mind. 
Comments and feedback welcome.

Note that this patch can't be applied yet, my paperwork is still not 
finished :(

Global-adjustments-to-the-default-face.patch
Description: Text Data