chatgui: add shutdown diagnostics (poll exit reason, cleanup steps, app.exec return)

tools/chatgui/transport/utun_node.cpp

@@ -344,16 +344,23 @@ void UtunNode::runLoop() {
         uasync_poll(ua, 100);
     }
 
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "runLoop: poll exit m_stop=%d g_shutdown=%d", (int)m_stop, (int)g_shutdown);
+
     signal(SIGINT, SIG_DFL);
     signal(SIGTERM, SIG_DFL);
     g_signal_ua = nullptr;
 
     etcp_router_bind(m_instance, ETCP_RT_ID_CHAT, nullptr);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "runLoop: etcp_router_unbind done");
     chat_sync_destroy(m_instance);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "runLoop: chat_sync_destroy done");
     chat_core_destroy(m_instance);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "runLoop: chat_core_destroy done");
     utun_instance_destroy(m_instance);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "runLoop: utun_instance_destroy done");
     m_instance = nullptr;
     uasync_destroy(ua, 0);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "runLoop: uasync_destroy done, emitting stopped");
     g_currentNode = nullptr;
     QMetaObject::invokeMethod(this, [this] { emit stopped(); });
 }