GNU bug report logs - #77916
Unicode Variation Selector 15 ignored by emacs GTK and honoured by emacs -nw

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From: Дилян Палаузов
 <dilyan.palauzov <at> aegee.org>
To: 77916 <at> debbugs.gnu.org
Subject: bug#77916: Unicode Variation Selector 15 ignored by emacs GTK and honoured by emacs -nw
Date: Sat, 19 Apr 2025 09:15:31 +0300

Hello,

I load https://cal.aegee.org/s/0/e947872a-224b-4c84-8d25-90a541a9ec6-318.ics_en.html using emacs eww.  The file contains on the When line the Unicode Clock Face Twelve O’clock emoji followed by Unicode Variation Selector 15, which means that the clock must be presented in text mode (without colour).

I use emacs 29.4 (GTK+ Version 3.24.43, cairo 1.18.2) and `emacs -nw'.

emacs -nw eww shows the 12 O’clock emoji in text mode.  At the same time emacs GTK shows the clock in colour mode.

emacs -nw eww shows <h1><span data-nosnippet style='background-color:#ffd700;color:#000;display:block;padding:0 .5rem'>NWM: Pescara, the next treasure island🏝️ !</span></h1> with a black hole after the island emoji, while emacs GTK does not show that black hole.

The file contains many more emojis and all of these appear correct.

If I move the file as-is in a different domain, emacs -nw inserts after the hyperlinks behind “Link to calendar” and “iCalendar file” an exclamation mark.  emacs GTK also puts behind the same hyperlinks an exclamation mark and the hyperlinks on their own are with blue colour on red background.  This has bad contrast and is hard perceive.

So:
• the clock in not in text mode in emacs GTK, but in text mode in emacs -nw? (Likewise for the globe on the next line).  N.B. Epiphany (WebKitGTK does the same for the clock - cf. https://bugs.webkit.org/show_bug.cgi?id=290996 , contrary to Firefor or Chromium on Linux.  WebKitGTK/Epiphany however render the island emoji in text mode, which emacs GTK, emacs -nw, Firefox and Chromium do not do.)
• emacs GTK shows the two hyperlinks in bad contrast (red background, blue text)
* Why the exclamation mark after the URLs?
* Can the black hole after the island emoji be avoided in emacs -nw?

Kind regards
  Дилян

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