Minor mode hook run when mode is deactivated?

[Joost Kremers <joostkremers@fastmail.fm>]

Hi,

I recently ran into a problem that was apparently caused by a 
minor mode hook being run when the mode is deactivated. 
Counter-intuitive as that may be (to me, at least), a quick look 
at the code for `define-minor-mode` seems to suggest that it's in 
fact correct.

Is there a rationale behind this? I noticed in the code that there 
are actually two more hooks, `<mode>-on-hook` and 
`<mode>-off-hook`, which according to a comment in the code are 
there for backward compatibility only. Which suggests that someone 
at some point thought about these things and made a conscious 
decision to this effect.

Which in turn makes me wonder what the rationale was for that 
decision. :-) Also, I haven't been able to find any info on this 
in the Elisp and Emacs manuals. Aren't minor modes supposed to be 
turned off?

TIA


-- 
Joost Kremers
Life has its moments