bug#70989: 29.3; Calling isearch-forward when using Unifont throws error "Invalid font name"

[Po Lu]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Rodrigo Morales <me@rodrigomorales.site>
>> CC: <70989@debbugs.gnu.org>
>> Date: Thu, 16 May 2024 15:09:14 -0500
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> > What does the below show after you start Emacs?
>> >
>> >   M-: (face-font 'default) RET
>> 
>> "-GNU-Unifont-medium-normal-normal-Sans-Serif-16-*-*-*-c-80-iso10646-1"
>
> That "Sans-Serif" part is the problem: it shouldn't have the dash.
>
> Po Lu, any idea where does that get appended to the font's name, and
> why?

Rodrigo, would you please let us know which font driver this font is
loaded by?  Please type M-x describe-char RET with point on a character
in the default font, and respond with the output of the Help buffer.