How do I “unbind” Ctrl+BackSpace in URxvt?

Question

My URxvt is mapping the Ctrl+Backspace key combination to Ctrl+H. This is extremely annoying when using GNU Emacs.

How do I change that behavior?

Answer 1

After searching some more for this solution, I've found out an alternate solution. I'm mapping Ctrl+BackSpace to some other key combination and then I'm mapping this new combination to the desired behavior in my GNU Emacs.

To achieve this, add this to ~/.Xdefaults (or whatever your distro uses for this):

URxvt.keysym.C-BackSpace: \033[33~

I'll leave this question open until a proper alternative appears (one that makes urxvt simply ignore it).

BONUS

To map this new key binding into GNU Emacs, you can use the describe-key function (usually C-h k) and type Ctrl+BackSpace to find out how the editor is seeing this stuff. In my case, it was "S-". To achieve the desired behavior, in my case, I added this to ~/.emacs:

(global-set-key (kbd "S-<f9>") 'backward-kill-word)