Application doesn't load on Fedora 36

[ghost]

The application will not even start in Fedora 36, I tried to start it from the terminal and got the following.

❯ ./Speek.Chat-1.7.0-x86_64.AppImage 
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.

(speek:6518): GLib-GIO-ERROR **: 14:26:46.077: Settings schema 'org.gnome.settings-daemon.plugins.xsettings' does not contain a key named 'antialiasing'
Trace/breakpoint trap (core dumped)

[Speek-App]

Thanks a lot for opening this issue.

I played a bit around with Fedora 36 and there seems to be an issue with wayland. From what I found, GTK applications are hitting this error under wayland on GNOME 40. But it can be fixed by providing the environment variable GDK_BACKEND=x11 (important -> lowercase x).

So, as a temporary fix, you can start Speek like this:
GDK_BACKEND=x11 ./Speek.Chat-1.7.0-x86_64.AppImage

If this is indeed the issue here as well, the easiest fix for this should be to update the .desktop file provided with Speek.

[goo99x]

Had the same issue on Ubuntu 22.04.
Upstream bug id: https://gitlab.gnome.org/GNOME/gtk/-/issues/3680
I used the workaround from https://gitlab.gnome.org/GNOME/gtk/-/issues/3680#note_1125035. Copied here for reference:

From
/usr/share/glib-2.0/schemas/org.gnome.settings-daemon.plugins.xsettings.gschema.xml
I just removed

19,20d18
<   </schema>
<   <schema id="org.gnome.settings-daemon.plugins.xsettings.deprecated">

and compiled: glib-compile-schemas /usr/share/glib-2.0/schemas
the font-manager is back to work