bug#21333: 25.0.50; window-size-change-functions not called after mini-window resize

[martin rudalics]

> I said "complexity".  A hook function for a hook that calls you
> indiscriminately can be very cheap performance-wise, but its
> complexity could be overwhelming, and the result could easily be
> fragile.
...
> Inaccurate hooks make this task very hard and prone to breakage with
> each new release.

We agree.  And we are currently trying to become more discriminative.

martin