Upstream maintainer here. In the initial comment of the bug report, there are two different warnings. Both of them were displayed (I think) because historically (until release 3.20) Dconf Editor was using a custom schemas parser.
The first: ** (dconf-editor:29681): WARNING **: dconf-schema.vala:330: Unknown property on <schema>, extends was a bug of Dconf Editor, as that property is valid. The second: ** (dconf-editor:29681): WARNING **: dconf-schema.vala:401: Unknown tag <comment> looks more weird to me, as the tag <comment> should never have been accepted when compiling the schema (see indicative DTD[1]). If you know what schema was causing that, please fix it and report a bug to glib-compile-schemas if it accepts even now to compile it. [1] https://gitlab.gnome.org/GNOME/glib/blob/master/gio/gschema.dtd Anyway, as Dconf Editor uses GLib.Settings for two years, the warnings shouldn’t be displayed anymore. Are you sure 3.22 has been concerned at one point here? -- Arnaud Bonatti ________________________________ courriel : arnaud.bona...@gmail.com