bug#28182: maybe implement CTRL++ to zoom text

[Robert Pluim]

>>>>> On Mon, 30 Sep 2019 09:16:16 +0300, Eli Zaretskii <eliz@gnu.org> said:

    >> From: Richard Stallman <rms@gnu.org>
    >> Cc: homeros.misasa@gmail.com, juri@linkov.net, stefan@marxist.se,
    >> 28182@debbugs.gnu.org, jidanni@jidanni.org
    >> Date: Sun, 29 Sep 2019 19:36:06 -0400
    >> 
    >> > Please tell what is your problem, and why "C-x C-+" doesn't solve it?
    >> 
    >> Does C-x C-+ increase the font size?

    Eli> Yes.  And "C-x C--" decreases it.

Whoever implemented this originally went a bit far, I think:

    C-x C-= runs the command text-scale-adjust (found in global-map),
    which is an autoloaded interactive compiled Lisp function in
    `face-remap.el'.

    It is bound to s-0, s-=, s-+, s--, C-x C-0, C-x C-=, C-x C--, C-x C-+.

Are those s- bindings really necessary? Hey, I have a usable super
key! :-)

Robert