Subject: Re: bug#77916: Unicode Variation Selector 15 ignored by emacs GTK and honoured by emacs -nw

From: Eli Zaretskii <[email-masked]>
Date: Sat, 19 Apr 2025 15:13:54 +0300

> From: Дилян Палаузов
> 	 <[email-masked]>
> Cc: [email-masked]
> Date: Sat, 19 Apr 2025 14:23:24 +0300
> 
> as image with the black hole is at https://mail.aegee.org/dpa/island/vc16-black-hole.png .

That seems to be a problem with the terminal emulator you are using?
It seems to ignore the background color of the face?

> With which font does it work?

It is easier for you to tell which font are you using with which it
doesn't work.  Use "C-u C-x =" at the buffer position of the clock to
show how Emacs displays that, and post here what it says in the *help*
buffer.

> The files https://cal.aegee.org/s/0/e947872a-224b-4c84-8d25-90a541a9ec6-318.ics_en.html  and https://mail.aegee.org/dpa/island/a.ics_en.html are identical, only the hosting domains are different.  But the two hyperlinks at the end of the file are shown differently, including colour and exclamation mark, both in GTK and -nw, when loaded via eww.

Ah, that's Emacs telling you that the link is suspicious.  Move the
mouse pointer to hover over the "warning" emoji, and Emacs will
explain the reason in a tooltip.

This is a feature, not a bug.

> Below I include the output of describe-fontset . Does it exlain why the clock is shown in colour?

No, but the output of "C-u C-x =" in the GTK session might.