bug#19972: 24.4; Font size change doesn't update (window-total-width)

[martin rudalics]

>> I'm not yet sure whether to fix this for Emacs 24.5 as well.
>
> Depends on whether this is a regression, and if so, since when.  Do
> you know?

2013-12-13 or 2013-12-04 I think.  The problem is that the fix would
have to be applied in change_frame_size_1 in dispnew.c and the relevant
parts have changed a lot in Emacs 25.  So it would not get any reliable
testing from users of Emacs 25.

martin