Re: Should mode commands be idempotent?

[Richard Stallman]

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  > I think it's generally expected that mode commands (both major and minor)
  > are reasonably idempotent, i.e. calling them twice should have the same
  > effects as calling them once (unless using 'toggle, of course). However, I
  > couldn't find this requirement in the manual, should it be added to the
  > "Modes" section?

This is the intended behavior, and has been all along.
It would be good to say so explicitly.

For major modes, as long as they work exclusively by setting
buffer-local variables and other per-buffer values (which they should),
kill-all-local-variables takes care of this automatically.

-- 
Dr Richard Stallman
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