[Bug 2184872] New: User installed Japanese fonts override system fonts when substituting glyphs

https://bugzilla.redhat.com/show_bug.cgi?id=2184872

Bug ID: 2184872
           Summary: User installed Japanese fonts override system fonts
                    when substituting glyphs
           Product: Fedora
           Version: 37
            Status: NEW
         Component: fontconfig
          Assignee: [e-mail]
          Reporter: [e-mail]
        QA Contact: [e-mail]
                CC: [e-mail], [e-mail],
                    [e-mail],
                    [e-mail], [e-mail],
                    [e-mail], [e-mail],
                    [e-mail], [e-mail]
  Target Milestone: ---
    Classification: Fedora

Description of problem:
When installing a Japanese font locally (using gnome font viewer, which
effectively copies to ~/.local/share/fonts/), with the default fontconfig, all
kana in the system uses that font.

However, it only affects certain applications. Firefox (rpm) and Inkscape
(flatpak) is affected, but gwrite is not.

Version-Release number of selected component (if applicable):
fontconfig-2.14.0-3.fc37.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Download the following font:
http://font.sumomo.ne.jp/fontdata-c2157415/k-font.zip
2. Unzip and install by double-clicking the font in nautilus and clicking
install.
3. Restart Firefox or Inkscape and paste "です” in a field with sans-serif or
system-ui font

Actual results:
Text appears with the new font

Expected results:
Text appears with the normal system font

Additional info:
Running pango-view, e.g. the following, works fine and selects a reasonable
font (Droid Sans Japanese):
FC_DEBUG=4 pango-view --font="system-ui" -t です | grep family

[Bug 2184872] User installed Japanese fonts override system fonts when substituting glyphs

https://bugzilla.redhat.com/show_bug.cgi?id=2184872

Akira TAGOH  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
           Doc Type|---                         |If docs needed, set a value
              Flags|                            |needinfo?(bztdlinux@gmail.c
                   |                            |om)

--- Comment #1 from Akira TAGOH  ---
Well, it seems the dead link.  What's the family name in that font?

If you are sure it happens with system-ui generic alias and then result is
different between fc-match and applications, you should report it to those
applications first.
Strictly speaking, they may have more additional parameters to query a font.
you may need to try it in the same condition. otherwise the result could be
different.

[Bug 2184872] User installed Japanese fonts override system fonts when substituting glyphs

https://bugzilla.redhat.com/show_bug.cgi?id=2184872

--- Comment #2 from Akira TAGOH  ---
Does this still happen on f38 or f39? there are nothing detailed information to
take a look at this. it is quite hard to fix.  This may be closed shortly
otherwise.

[Bug 2184872] User installed Japanese fonts override system fonts when substituting glyphs

https://bugzilla.redhat.com/show_bug.cgi?id=2184872

--- Comment #3 from Aoife Moloney  ---
This message is a reminder that Fedora Linux 37 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 37 on
2023-12-05.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with
a
'version' of '37'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, change the 'version' 
to a later Fedora Linux version. Note that the version field may be hidden.
Click the "Show advanced fields" button if you do not see it.

Thank you for reporting this issue and we are sorry that we were not 
able to fix it before Fedora Linux 37 is end of life. If you would still like 
to see this bug fixed and are able to reproduce it against a later version 
of Fedora Linux, you are encouraged to change the 'version' to a later version
prior to this bug being closed.

[Bug 2184872] User installed Japanese fonts override system fonts when substituting glyphs

https://bugzilla.redhat.com/show_bug.cgi?id=2184872

Akira TAGOH  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |CLOSED
         Resolution|---                         |INSUFFICIENT_DATA
        Last Closed|                            |2023-11-27 08:30:18

--- Comment #4 from Akira TAGOH  ---
Please reopen if you still see this issue. Thanks.