bug#37447: 26.3; Commands on <delete> and <backspace>

[Juri Linkov]

>> These key bindings are too old to change them in the default
>> configuration.
>
> So inconsistency with 'M-d' and 'M-<delete>' will stay and
> 'C-<backspace>' & 'M-<backspace>' doing the same thing will also stay
> because of history?  I could ignore 'C-S-<backspace>', but previous
> two cases should be "updated".
>
> But if "No." means "No." - close the bug, please.  Unless we are
> waiting for more opinions.

Imagine many users using the same keys for years, and now
they will start doing the opposite - a recipe for disaster.
But if a safer solution is possible, then I'd recommend
binding one of C- or M- prefixes to sexp killing commands
because their default prefix C-M- can't be used: C-M-DEL
runs system shutdown, and C-M-<backspace> kills the X server.
There is a replacement C-M-k for kill-sexp, but no key
for backward-kill-sexp.