bug#57639: Toggling, in general

[Richard Stallman]

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  > What kind of things are you thinking about?  Things like the menu bar,
  > tool bar, etc. are already toggled using minor modes.

What I have in mind is settings that have many possible values,
and there's a way to select a new setting.  It could be useful
to have a general way to toggle between the last two values
of the setting.

One such thing is the selected buffer.  Right now you toggle that with
C-x b RET, which may be the shortest sequence of keys we can get, but you
see what I mean.

Another is the current input method.  ISTR there is an ad-hoc command to
reselect the previous input method.  This is another thing that a general
toggle could handle, and avoid the ad-hoc additional command.


-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)