Bug 2415246 - Bad glyph substitution with IBM Plex Mono
Summary: Bad glyph substitution with IBM Plex Mono
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Fedora
Classification: Fedora
Component: fontconfig
Version: 44
Hardware: Unspecified
OS: Linux
unspecified
medium
Target Milestone: ---
Assignee: Akira TAGOH
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-11-16 09:33 UTC by Augusto Stoffel
Modified: 2025-11-17 11:33 UTC (History)
6 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2025-11-17 11:33:31 UTC
Type: ---
Embargoed:

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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.
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