[wayland] Keep Registry for internal connection around

Allows to interact with the Registry for the internal connection in
other parts of KWin and makes it possible to create more than just the
ShmPool for this Registry.

wayland_server.cpp

@@ -274,9 +274,10 @@ void WaylandServer::createInternalConnection()
         [this] {
             Registry *registry = new Registry(m_internalConnection.client);
             registry->create(m_internalConnection.client);
+            m_internalConnection.registry = registry;
             connect(registry, &Registry::shmAnnounced, this,
-                [this, registry] (quint32 name, quint32 version) {
-                    m_internalConnection.shm = registry->createShmPool(name, version, m_internalConnection.client);
+                [this] (quint32 name, quint32 version) {
+                    m_internalConnection.shm = m_internalConnection.registry->createShmPool(name, version, m_internalConnection.client);
                 }
             );
             registry->setup();

wayland_server.h

@@ -31,6 +31,7 @@ namespace KWayland
 namespace Client
 {
 class ConnectionThread;
+class Registry;
 class ShmPool;
 class Surface;
 }
@@ -131,6 +132,9 @@ public:
     KWayland::Client::ConnectionThread *internalClientConection() {
         return m_internalConnection.client;
     }
+    KWayland::Client::Registry *internalClientRegistry() {
+        return m_internalConnection.registry;
+    }
     void dispatch();
     quint32 createWindowId(KWayland::Server::SurfaceInterface *surface);
 
@@ -155,6 +159,7 @@ private:
     struct {
         KWayland::Server::ClientConnection *server = nullptr;
         KWayland::Client::ConnectionThread *client = nullptr;
+        KWayland::Client::Registry *registry = nullptr;
         KWayland::Client::ShmPool *shm = nullptr;
 
     } m_internalConnection;