#0  0x00007ff0e0153d57 in g_closure_invoke (closure=0x17d0f40, return_value=0x0, n_param_values=2, param_values=0x683ff60, invocation_hint=0x7fff52cc2140) at /build/buildd/glib2.0-2.29.10/./gobject/gclosure.c:751
        __PRETTY_FUNCTION__ = "g_closure_invoke"
#1  0x00007ff0e01668d7 in signal_emit_unlocked_R (node=<value optimized out>, detail=0, instance=0x1bb2010, emission_return=0x0, instance_and_params=0x683ff60) at /build/buildd/glib2.0-2.29.10/./gobject/gsignal.c:3186
        accumulator = 0x0
        emission = {next = 0x7fff52cc2790, instance = 0x1bb2010, ihint = {signal_id = 33, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = EMISSION_RUN, chain_type = 29011472}
        class_closure = 0x17d0f40
        hlist = 0x18553e8
        handler_list = <value optimized out>
        return_accu = 0x0
        accu = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
        signal_id = 33
        max_sequential_handler_number = 34920
        return_value_altered = <value optimized out>
#2  0x00007ff0e0170707 in g_signal_emit_valist (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>, var_args=0x7fff52cc2328) at /build/buildd/glib2.0-2.29.10/./gobject/gsignal.c:2987
        instance_and_params = 0x683ff60
        signal_return_type = 4
        param_values = 0x683ff78
        node = 0x17d0fb0
        i = <value optimized out>
        n_params = 1
        __PRETTY_FUNCTION__ = "g_signal_emit_valist"
#3  0x00007ff0e01708d2 in g_signal_emit (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>) at /build/buildd/glib2.0-2.29.10/./gobject/gsignal.c:3044
        var_args = {{gp_offset = 32, fp_offset = 48, overflow_arg_area = 0x7fff52cc2400, reg_save_area = 0x7fff52cc2340}}
#4  0x00007ff0e0f0459b in gtk_grab_notify_foreach (child=0x1bb2010, data=0x7fff52cc25e0) at /build/buildd/gtk+3.0-3.1.8/./gtk/gtkmain.c:2098
        __inst = 0x1bb2010
        __t = <value optimized out>
        __r = <value optimized out>
        info = 0x7fff52cc25e0
        was_grabbed = 0
        is_grabbed = 0
        was_shadowed = 0
        is_shadowed = 1
        devices = <value optimized out>
#5  0x00007ff0e0e2d1d3 in gtk_box_get_path_for_child (container=<value optimized out>, child=0x1823960) at /build/buildd/gtk+3.0-3.1.8/./gtk/gtkbox.c:922
        path = 0x0
        sibling_path = <value optimized out>
        box = <value optimized out>
        private = 0x7fff52cc25e0
        list = <value optimized out>
        children = <value optimized out>
#6  0x0000000000000000 in ?? ()
No symbol table info available.