bug#56102: 29.0.50; fit-frame-to-buffer's window-text-pixel-size calculation can be incorrect when only is set to vertically

[martin rudalics]

>> I don't know yet either.  I'll send you a patch as soon as I have one.
>
> Sounds good, thanks.

I suppose we can manage by fixing some trivial silliness in the code and
making the documentation tell what the code does.  If you don't see any
problems with the attached diff within a week or so, I'll push it.

Thanks, martin

fit-frame-to-buffer.diff
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