Kenichi Handa <handa@m17n.org> writes:

> In article <87he8kutns.fsf@ID-87814.user.dfncis.de>, Oliver Scholz <alkibiades@gmx.de> writes:
>> Is there any special reason why `set-fontset-font' should raise an
>> error, if CHARACTER specifies a single byte char? The patch below
>> seems to work, but I may be missing something.
>
> Thank you for working on it.
>
> If we change the ASCII font in the fontset of the default
> face, I think it should have the same effect as changing the
> font of the default face (e.g. changing the font size
> results in chaning the frame size).  The reason I inhibitted
> changing ASCII font in a fontset is that it seems difficult
> to achieve that effect (or at least I didn't know how to do
> that when I wrote the code).  Does you change pay attetion
> to that?
[...]

It doesn't, sorry. I didn't realize that this could be an issue,
because I use an window manager which keeps frames full-size anyways.

But I spent the afternoon browsing the sources for a solution that
does. The two patches below seem to make it work (only slightly
tested).

Now, if an ASCII font was changed, Fset_fontset_font checks all frames
whether FONTSET is their frame fontset and forces a resizing of all
frames that have. This is done by the new function
x_new_fontset_force, which is like x_new_fontset, except that it does
its works even if new fontset = old fontset. (This is done by
factoring out a new function x_set_fontset_internal out of x_set_fontset.)

    Oliver