[AC] Cater to the fact that default face height might be 0

[Michael Sperber]

"Stephen J. Turnbull" <stephen at xemacs.org> writes:

> Michael Sperber writes:
>
> It may just be that somehow the default metrics are being requested
> while the font object is being built "just this once" at dump time,
> but it worries me.  I kinda think this should be an assert....

It happens very early.

Generally, all the geometry code that tries to compute character-based
metrics based upon the intrinsic assumption that fonts are fixed-width
and all have the same width and ditto for the height needs killing.

-- 
Cheers =8-} Mike
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