Subject: Re: bug#61196: 30.0.50; X11 rendering of horizontal line in log-edit mode fails with some fonts

From: Eli Zaretskii <[email-masked]>
Date: Wed, 01 Feb 2023 05:37:10 +0200

> Cc: [email-masked]
> Date: Wed, 01 Feb 2023 09:29:08 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <[email-masked]>
> 
> When I last investigated this problem (I use the X core font backend all
> the time), it was that X fonts typically have no glyph for the newline
> character, which Emacs seems to expect.

No, Emacs doesn't use the glyph for newline.  It starts a new screen
line instead.  But that requires the default face to have a valid
font, AFAIU.