bug#60210: 30.0.50; tab-bar height not recalculated when face changes

[Gregory Heytings]

> > > I doubt the font-related changes are relevant, but bisecting will be 
> > > welcome.
> >
> > Indeed, the culprit is 5db4ec20fe.
> >
> > Patch attached.
>
> Thanks, this LGTM.  If you tested this with tab bars of more than a 
> single line, including when tabs are removed so a single line is once 
> again long enough, please install on the release branch.

I did test it, but I don't use tab bars, so I'm not 110% sure.  Juri, 
could you please test the patch?