bug#52493: 29.0.50; Setting Inconsolata up in init.el makes default face rendered wrong

[Eli Zaretskii]

> Date: Wed, 21 Dec 2022 23:39:34 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: Eli Zaretskii <eliz@gnu.org>, Lars Ingebrigtsen <larsi@gnus.org>, 
>     rudalics@gmx.at, rpluim@gmail.com, 52493@debbugs.gnu.org
> 
> > 2. I start 'emacs -Q' and evaluate (set-face-attribute 'default nil 
> > :height 105 :family "Inconsolata_dz") in *scratch*. I get that 
> > weird-looking font that blinks briefly in scenario 1. 'M-x describe-face 
> > RET default' reports "Ubuntu Condensed" as family.
> >
> 
> Again, can you try to evaluate (set-face-attribute 'default nil :height 
> 110 :font "Inconsolata_dz") (with ":font", not ":family") instead, and 
> tell us what happens?
> 
> Can you try your other recipes, using ":font" where you used ":family", 
> and tell us whether what happens is what you expected?

What is the significance of using :font instead of :family in these
cases, for the purpose of discussing and investigating this issue?