bug#69097: [PATCH] Add 'kill-region-or-word' command

[Juri Linkov <juri@linkov.net>]

>> > +(defcustom kill-word-if-no-region nil
>> > +  "Non-nil means that `kill-region' without a region will kill the last word."
>> > +  :type 'boolean
>> > +  :group 'killing)
>>
>> What a strange thing.  `kill-region' is not related to word commands
>> in no way.  Why not kill a sentence?  Why not kill a line?  Why just word?
>> All existing commands handle an active region.  But there is no commands
>> that do in the opposite direction where a general command handles
>> one random specific case.  This is because the region is a more
>> general concept.
>
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=69097#14 is supposed to
> provide the rationale (consistency with what C-w does in a terminal,
> which I presume means in Bash or similar programs which use
> Readline?).

So this is for Readline compatibility:

  unix-word-rubout (C-w)
    Kill the word behind point, using white space as a word boundary.
    The killed text is saved on the kill-ring.

Then I have no opinion, since 'backward-kill-word' (C-<backspace>, M-DEL).
already does this just fine.