fix: fix ddm stuck into dead event loop after crash recovery

The commit add deletion of old wayland objects if possible, during the
connecting process of TreelandConnector, which can prevent ddm stuck
into dead event loop of QSocketNotifier after crash recovery.

Author: calsys456

src/daemon/TreelandConnector.cpp

@@ -128,6 +128,7 @@ bool TreelandConnector::isConnected() {
 }
 
 void TreelandConnector::setPrivateObject(struct treeland_ddm *ddm) {
+    if (m_ddm) delete m_ddm;
     m_ddm = ddm;
 }
 
@@ -166,7 +167,7 @@ void registerGlobal(void *data, struct wl_registry *registry, uint32_t name, con
 }
 
 void removeGlobal([[maybe_unused]] void *data, [[maybe_unused]] struct wl_registry *registry, [[maybe_unused]] uint32_t name) {
-    // Do not deregister the global object (set m_priv to null) here,
+    // Do not deregister the global object (set m_ddm to null) here,
     // as wlroots will send global_remove event when session deactivated,
     // which is not what we want. The connection will be preserved after that.
 }
@@ -177,6 +178,12 @@ const struct wl_registry_listener registryListener {
 };
 
 void TreelandConnector::connect(QString socketPath) {
+    if (m_display) {
+        wl_display_disconnect(m_display);
+        QObject::disconnect(m_notifier, &QSocketNotifier::activated, nullptr, nullptr);
+        delete m_notifier;
+    }
+
     m_display = wl_display_connect(qPrintable(socketPath));
     auto registry = wl_display_get_registry(m_display);