Comment 2 for bug 1668917

StacktraceTop:
 gx.terminix.customtitle.CustomTitle.onButtonPress() (this=0x7f4d1b5be000, event=0x7f4d1b5bd320, widget=<optimized out>) at /build/terminix-XVLUcN/terminix-1.4.2/source/gx/terminix/customtitle.d:107
 gtk.Widget.Widget.callBackButtonPressEventGeneric() (widgetStruct=<optimized out>, widgetStruct@entry=0x557f858fe410, event=0x557f85b54830, wrapper=0x7f4d1b5d1b40) at Widget.d:6184
 _gtk_marshal_BOOLEAN__BOXED (closure=0x557f8590c560, return_value=0x7fff0e5e4a50, n_param_values=<optimized out>, param_values=0x7fff0e5e4ab0, invocation_hint=<optimized out>, marshal_data=<optimized out>) at ././gtk/gtkmarshalers.c:86
 g_closure_invoke () from /tmp/apport_sandbox_zAbG47/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 signal_emit_unlocked_R () from /tmp/apport_sandbox_zAbG47/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0