[wayland] Destroy input method connection after process finished

More cleanup.

main_wayland.cpp

@@ -188,6 +188,15 @@ void ApplicationWayland::continueStartupWithX()
             environment.remove("DISPLAY");
             environment.remove("WAYLAND_DISPLAY");
             QProcess *p = new QProcess(this);
+            auto finishedSignal = static_cast<void (QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished);
+            connect(p, finishedSignal, this,
+                [this, p] {
+                    if (waylandServer()) {
+                        waylandServer()->destroyInputMethodConnection();
+                    }
+                    p->deleteLater();
+                }
+            );
             p->setProcessEnvironment(environment);
             p->start(m_inputMethodServerToStart);
             p->waitForStarted();

wayland_server.cpp

@@ -71,7 +71,10 @@ WaylandServer::WaylandServer(QObject *parent)
     qRegisterMetaType<KWayland::Server::OutputInterface::DpmsMode>();
 }
 
-WaylandServer::~WaylandServer() = default;
+WaylandServer::~WaylandServer()
+{
+    destroyInputMethodConnection();
+}
 
 void WaylandServer::destroyInternalConnection()
 {
@@ -292,6 +295,15 @@ int WaylandServer::createInputMethodConnection()
     return sx[1];
 }
 
+void WaylandServer::destroyInputMethodConnection()
+{
+    if (!m_inputMethodServerConnection) {
+        return;
+    }
+    m_inputMethodServerConnection->destroy();
+    m_inputMethodServerConnection = nullptr;
+}
+
 void WaylandServer::createInternalConnection()
 {
     int sx[2];

wayland_server.h

@@ -115,6 +115,7 @@ public:
      * @returns file descriptor to the input method server's socket.
      **/
     int createInputMethodConnection();
+    void destroyInputMethodConnection();
 
     void createInternalConnection();
     void destroyInternalConnection();