#0  0x00007f8228653d5f in g_type_check_instance_is_fundamentally_a () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#1  0x00007f82286369bb in g_object_get () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#2  0x000055873b93e25a in  ()
#3  0x000055873b93eab1 in  ()
#4  0x000055873b94c201 in  ()
#5  0x00007f822862e1d6 in  () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#6  0x00007f822864981f in g_signal_emit_valist () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#7  0x00007f8228649f4f in g_signal_emit () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#8  0x00007f822935543d in  () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#9  0x00007f8229355495 in  () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#10 0x00007f822862df9d in g_closure_invoke () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#11 0x00007f8228640e2e in  () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#12 0x00007f8228649535 in g_signal_emit_valist () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x00007f8228649f4f in g_signal_emit () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#14 0x00007f82293538f0 in  () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#15 0x00007f8221ba0e18 in ffi_call_unix64 () at /usr/lib/x86_64-linux-gnu/libffi.so.6
#16 0x00007f8221ba087a in ffi_call () at /usr/lib/x86_64-linux-gnu/libffi.so.6
#17 0x00007f822862eb8d in g_cclosure_marshal_generic_va () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#18 0x00007f822862e1d6 in  () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#19 0x00007f822864981f in g_signal_emit_valist () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#20 0x00007f8228649f4f in g_signal_emit () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#21 0x00007f8229411a41 in  () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#22 0x00007f8228630ea8 in g_cclosure_marshal_VOID__BOXEDv () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#23 0x00007f822862e1d6 in  () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#24 0x00007f822864981f in g_signal_emit_valist () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#25 0x00007f8228649f4f in g_signal_emit () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#26 0x00007f822940ecbe in  () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#27 0x00007f82294102ab in  () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#28 0x00007f8229412fae in  () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#29 0x00007f82293e03a1 in gtk_event_controller_handle_event () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#30 0x00007f82295a386b in  () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#31 0x00007f822945b347 in  () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#32 0x00007f822862e1d6 in  () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#33 0x00007f82286491ed in g_signal_emit_valist () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#34 0x00007f8228649f4f in g_signal_emit () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#35 0x00007f82295a5b04 in  () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#36 0x00007f82294581de in  () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#37 0x00007f822945a358 in gtk_main_do_event () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#38 0x00007f8228f594a5 in  () at /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#39 0x00007f8228f8a952 in  () at /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#40 0x00007f8228354f77 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#41 0x00007f82283551b0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#42 0x00007f82283554c2 in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007f8229459435 in gtk_main () at /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#44 0x000055873b9345f9 in _vala_main ()
#45 0x00007f82271481c1 in __libc_start_main (main=0x55873b934280 <main>, argc=1, argv=0x7ffdd0c082b8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffdd0c082a8) at ../csu/libc-start.c:308
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -1254205197811211380, 94039308452496, 140728105730736, 0, 0, -5013071883268807796, -5002916415897754740}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7ffdd0c082c8, 0x7f822a49a150}, data = {prev = 0x0, cleanup = 0x0, canceltype = -792689976}}}
        not_first_call = <optimized out>
#46 0x000055873b9342ba in _start ()