bug#11276: minibuffers windows can no longer explictly be resized

[martin rudalics]

>>  >> First bug.  I forgot that one can invoke `enlarge-window' and
>>  >> `shrink-window' in the minibuffer window.  I'm not sure though whether 
these
>>  >> should have any effect when `resize-mini-windows' is non-nil.
>>  >
>>  > For compatibility with previous versions of Emacs, I think it
>>  > shouldn't, at least not on the emacs-24 branch.
>>
>> Sorry, my formulation was probably unclear.
>
> No, it was perfectly clear.  It's my wording that is confusing.  What
> I meant to say is that, for compatibility, resize-mini-windows should
> have no effect on "C-x ^" typed from the minibuffer window.

OK

>>  > resize-mini-windows is a misnomer: it actually means "mini-window size
>>  > is controlled by display engine".  That's why window-sizing commands
>>  > in previous versions never paid heed to it, only redisplay did.  And
>>  > that's why, quite counter-intuitively, setting it to _nil_ allows the
>>  > user to resize the mini-window.
>>
>> The passive mini-window IIUC.
>
> Yes.

I checked in a fix similar to the one I posted earlier.  Please test it
with C-x ^ and modeline dragging.

Thanks, martin