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

[martin rudalics]

>> In that case, I guess if you call (window-total-width 'round), you
>> will see the correct value even before "C-x 3", right?
>
> No, it doesn't. It still returns 240, i.e., the same value returned by
> (window-total-width).

Observe that

(window-total-width 'round)

should get you

(wrong-type-argument window-valid-p round)

As a rule `window-' prefixed functions require a window as first
argument.

The form to evaluate should be either (window-total-width nil 'ceiling)
or (window-total-width nil 'floor).  Any other value for ROUND behaves
like `window-total-width' called without ROUND argument.

martin