Question

Is it possible to disable text Scaling in Emacs?
Whenever I reverse the undo direction (C-x C–), the text size decreases.
I am using Emacs 24 with Prelude on Ubuntu 12.04

Answer 1

In addition to @xfq’s answer, you can turn off scaling by unsetting the key in your init file, or your .emacs file (available at ~/.emacs).

(global-unset-key (kbd "C-x C--"))

(remember that you can reload the file without restarting emacs using M-x load-file .emacs when you’re done editing)

You can read more on these commands by typing C-h f text-scale-adjust RET. text-scale-adjust is bound to C-x C-0, and resets any scaling performed by C-x C-- or C-x C-+, as explained in that page.