/usr/share/glib-2.0/schemas/org.gnome.gthumb.comments.gschema.xml is in gthumb-data 3:3.4.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | <?xml version="1.0" encoding="UTF-8"?>
<schemalist>
<schema path="/org/gnome/gthumb/comments/" id="org.gnome.gthumb.comments">
<key type="b" name="synchronize">
<default>true</default>
</key>
</schema>
</schemalist>
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