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

[martin rudalics]

>>> - Consider the case of full-screen frames, which never change in pixel
>>>    size. The window-width should change when the font size changes in
>>>    this case too.
>>
>> This is the case (hopefully) with Emacs 25 but not with Emacs 24.5.
>> Although some window managers may refuse to change the frame size even
>> with Emacs 24.5 as we've learned here.
>
>
>
> It’s not the case on OS X with Emacs HEAD from 19th Feb, at least.

I meant that with Emacs 25 full-screen frames should never change in
pixel size when the default font changes.  On all platforms.  And people
should see the `window-total-width' problem on all systems with current
trunk.  Have you tried the patch I posted in this thread?

>> With Emacs 25 you can do, for example,
>>
>> (let ((frame-inhibit-implied-resize t))
>>   (custom-push-theme 'theme-face 'default 'user 'set '((t (:height 128))))
>>   (face-spec-recalc 'default (selected-frame)))
>>
>> unless you have set `frame-inhibit-implied-resize' to non-nil already.
>
>
> Interesting: I hadn’t seen that. The above snippet still results in a changed 
frame size on my system, though.

We would have to investigate that.  It might mean that OS X changes the
frame size deliberately.  But Emacs should not request such a change
with the above snippet.

martin