Bug 2415246

Summary:	Bad glyph substitution with IBM Plex Mono
Product:	[Fedora] Fedora	Reporter:	Augusto Stoffel <arstoffel>
Component:	fontconfig	Assignee:	Akira TAGOH <tagoh>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	44	CC:	ajax, fonts-bugs, i18n-bugs, mclasen, rstrode, tagoh
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OS:	Linux
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Last Closed:	2025-11-17 11:33:31 UTC	Type:	---
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Description Augusto Stoffel 2025-11-16 09:33:52 UTC

Depending on certain font configurations, the character ⊞ is displayed as ⊠.  (I assume this is a problem in fontconfig but it could be somewhere else.)

Reproducible: Always

Steps to Reproduce:
1. Configure GNOME Terminal or Foot to use the IBM Plex Mono font.
2. Insert or paste the character ⊞ (SQUARED PLUS, codepoint 0x229E).

Actual Results:
The displayed character is ⊠ (SQUARED TIMES, codepoint 0x22A0)

Comment 1 Akira TAGOH 2025-11-17 03:42:41 UTC

Not a fontconfig issue and depends on what a font you have installed there. Apparently IBM Plex Mono doesn't have glyphs for U+229e nor U+22a0.  It implies that you have fonts something wrongly assigned those glyphs.

There are some ways to see what is wrong though, you can get a list of fonts which has them:

$ fc-list :charset=0x229e

and then check them with fontforge for example.

Comment 2 Augusto Stoffel 2025-11-17 11:33:31 UTC

Thanks for the pointer.  I tracked it down to JetBrains Mono.  There already is a bug report upstream.