bug#12419: Mouse click changes layout

[martin rudalics]

> No, I don't see that in Emacs 20 (I don't have 19).  I not only have a copy of
> it hanging around, I use it much of the time!

According to the ChangeLogs `adjust-window-trailing-edge' was introduced
with Emasc 22 so you should see it even with Emacs 21.

>> The "shrink only the adjacent
>> window" behavior you mention was introduced together with
>> `adjust-window-trailing-edge'.
>
> Maybe, but in Emacs 20 I still see only the adjacent window shrink.  I'm on MS
> Windows - dunno whether that make a difference.
>
> GNU Emacs 20.7.3 (i386-*-nt5.1.2600) of Thu Dec 21 2000 on buffy

Strange.  Maybe my memory fails.

> It would be good to present the alternative behaviors to people in emacs-devel
> (and maybe even help-gnu-emacs), so they can make an informed choice.  And it
> might be good to let end users have a choice (e.g., via an option), if that's
> feasible.

It's not (very) feasible in the case at hand.

> Before inclusion in a release, a change should be available in a pretest
> (prerelease version), and users can test it there.  But perhaps there was not
> enough pretest time.  I believe that pretests used to be longer in the old 
days.
>
> For another thing, users of a pretest should be informed (at least via NEWS, 
and
> preferably on emacs-devel by anyone who wants something specific tested during
> pretest) about new features to be tested.

The routines were installed on 2011-06-10.  There was plenty of time to
test them till the release of Emacs 24.1.

martin