Comment 11 for bug 1807127

On cosmic the SRU fixes the thumbnail creation, but starting from a command line nautilus shows those G_IS_OBJECT (object) warnings

#0 g_log (log_domain=0xb70fd07b "GLib-GObject",
    log_level=G_LOG_LEVEL_CRITICAL,
    format=0xb7f186b2 "%s: assertion '%s' failed")
    at ../../../../glib/gmessages.c:1412
#1 0xb7ec9249 in g_return_if_fail_warning (
    log_domain=0xb70fd07b "GLib-GObject",
    pretty_function=0xb7100334 <__func__.14497> "g_object_ref",
    expression=0xb70ff236 "G_IS_OBJECT (object)")
    at ../../../../glib/gmessages.c:2762
#2 0xb70d1990 in g_object_ref (_object=0x0)
    at ../../../../gobject/gobject.c:3212
#3 0xb6ff93f4 in get_preview_thumbnail (size=<optimized out>,
    uri=<optimized out>) at gnome-desktop-thumbnail.c:972
#4 gnome_desktop_thumbnail_factory_generate_thumbnail (factory=0xb70158,
    uri=0x9565a0 "file:///usr/share/backgrounds/Ross_Jones_Rockpool_(Sydney)_by_Chris_Carignan.jpg", mime_type=0x8d88a0 "image/jpeg")
    at gnome-desktop-thumbnail.c:1058
#5 0x0048dc13 in ?? ()
#6 0xb71aa7bf in g_task_thread_pool_thread (thread_data=0xabf290,
    pool_data=0x0) at ../../../../gio/gtask.c:1331
#7 0xb7eeb30d in g_thread_pool_thread_proxy (data=0x620ba0)
    at ../../../../glib/gthreadpool.c:307
#8 0xb7eea8ba in g_thread_proxy (data=0x78c780)
    at ../../../../glib/gthread.c:784
#9 0xb6a22fed in start_thread (arg=0xadeecb40) at pthread_create.c:486
#10 0xb6936a76 in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:108

Unsure if that should block the SRU though? (there is no warning when using the bionic libgnome-desktop-3-17 version (pre-bubblewrap changes)