[Webkit-unassigned] [Bug 222883] New: with bwrap fonts are not antialiased on wayland native (i.e. /etc/fonts not considered)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222883

            Bug ID: 222883
           Summary: with bwrap fonts are not antialiased on wayland native
                    (i.e. /etc/fonts not considered)
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: h.c.f.mueller at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 422524

  --> https://bugs.webkit.org/attachment.cgi?id=422524&action=review

effect of bug in evolution

I observe with native wayland the font settings in /etc/fonts are not considered, i.e. fonts are not antialised in the evolution email body handled by webkit, ref. attached picture. Evolution in debian 11 is using libwebkit2gtk-4.0-37 (2.30.5-1) with bwrap.

Font antialiazing in fact is correct in the following cases:
- with X11 (instead of wayland) OR
- bwrap is disabled (i.e. WEBKIT_FORCE_SANDBOX=0 evolution) OR
- wayland running in virtual machine (for my case VMWare Player 12 on Windows 10) OR
- /etc/fonts is overrided by ~/.config/fontconfig/fonts.conf

This bug is not specific to debian. It has been also observed e.g. on arch linux:
- https://bbs.archlinux.org/viewtopic.php?id=262384
- https://gitlab.gnome.org/GNOME/evolution/-/issues/1161

The bug is still present in debian experimental with libwebkit2gtk-4.0-37 (2.31.90-1).

My ~/.config/fontconfig/fonts.conf as a workaround to work on wayland with sandboxing:
<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>
        <match target="font">
                <edit mode="assign" name="antialias"><bool>true</bool></edit>
                <edit mode="assign" name="embeddedbitmap"><bool>false</bool></edit>
                <edit mode="assign" name="hinting"><bool>true</bool></edit>
                <edit mode="assign" name="hintstyle"><const>hintslight</const></edit>
                <edit mode="assign" name="lcdfilter"><const>lcddefault</const></edit>
                <edit mode="assign" name="rgba"><const>rgb</const></edit>
        </match>
</fontconfig>

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