bug#32672: 27.0.50; image resize on window resizing

[martin rudalics]

> I think window hook calls should be consistent at least with own inner logic,
> e.g. as the semantics of the window-size-change-functions hook name suggests
> it should be called when the window size is not the same as was before,
> window-configuration-change-hook is called when the result of window-state-get
> is not the same as it was before, etc.

Tying 'window-configuration-change-hook' to 'window-state-get' would
be considerably more than we do now or what I'd propose.  We probably
shouldn't care about a specific window's scroll bars or margins there.

martin