Extend the existing alternative set of key bindings for terminals (was: Second Ctl in keychord not detected)

[Ihor Radchenko <yantar92@gmail.com>]

"Loris Bennett" <loris.bennett@fu-berlin.de> writes:

>> Then, it is terminal input problem. See
>> https://stackoverflow.com/questions/11110801/why-does-ctrl-not-work-when-i-bind-it-to-a-command-in-emacs/11118511#11118511
>
> You're right, the problem also happens locally when I start Emacs with
> '-nw'.  Thanks for the link - I'll have a look at the various solutions,
> although it might just be easier to rebind the command ;-)

On Org side, we have an alternative set of key bindings that is more
compatible with terminals (see org-use-extra-keys). I think that C-c C-,
should also be covered there. Or maybe some other keys as well.

Loris, would you be interested to check which default bindings from
org-mode-map work and which don't work in tmux/terminal and report here?

Also, it appears to me that we may keep losing terminal-incompatible
keys in future unless we provide some mechanisms to check terminal
compatibility automatically. Any ideas?

Best,
Ihor