Implement screencasting protocol v4

This makes it possible to give the virtual output a better
user visible name.

src/plugins/screencast/screencastmanager.cpp

@@ -55,11 +55,12 @@ void ScreencastManager::streamWindow(ScreencastStreamV1Interface *waylandStream,
 
 void ScreencastManager::streamVirtualOutput(ScreencastStreamV1Interface *stream,
                                             const QString &name,
+                                            const QString &description,
                                             const QSize &size,
                                             double scale,
                                             ScreencastV1Interface::CursorMode mode)
 {
-    auto output = kwinApp()->outputBackend()->createVirtualOutput(name, name, size, scale);
+    auto output = kwinApp()->outputBackend()->createVirtualOutput(name, description, size, scale);
     streamOutput(stream, output, mode);
     connect(stream, &ScreencastStreamV1Interface::finished, output, [output] {
         kwinApp()->outputBackend()->removeVirtualOutput(output);

src/plugins/screencast/screencastmanager.h

@@ -36,6 +36,7 @@ private:
     streamOutput(ScreencastStreamV1Interface *stream, Output *output, ScreencastV1Interface::CursorMode mode);
     void streamVirtualOutput(ScreencastStreamV1Interface *stream,
                              const QString &name,
+                             const QString &description,
                              const QSize &size,
                              double scale,
                              ScreencastV1Interface::CursorMode mode);

src/wayland/screencast_v1.cpp

@@ -15,7 +15,7 @@
 
 namespace KWin
 {
-static int s_version = 3;
+static int s_version = 4;
 
 class ScreencastStreamV1InterfacePrivate : public QtWaylandServer::zkde_screencast_stream_unstable_v1
 {
@@ -105,6 +105,17 @@ public:
     {
         Q_EMIT q->virtualOutputScreencastRequested(createStream(resource, streamid),
                                                    name,
+                                                   QString(),
+                                                   {width, height},
+                                                   wl_fixed_to_double(scale),
+                                                   ScreencastV1Interface::CursorMode(pointer));
+    }
+
+    void zkde_screencast_unstable_v1_stream_virtual_output_with_description(Resource *resource, uint32_t streamid, const QString &name, const QString &description, int32_t width, int32_t height, wl_fixed_t scale, uint32_t pointer) override
+    {
+        Q_EMIT q->virtualOutputScreencastRequested(createStream(resource, streamid),
+                                                   name,
+                                                   description,
                                                    {width, height},
                                                    wl_fixed_to_double(scale),
                                                    ScreencastV1Interface::CursorMode(pointer));

src/wayland/screencast_v1.h

@@ -57,7 +57,7 @@ public:
 
 Q_SIGNALS:
     void outputScreencastRequested(ScreencastStreamV1Interface *stream, OutputInterface *output, CursorMode mode);
-    void virtualOutputScreencastRequested(ScreencastStreamV1Interface *stream, const QString &name, const QSize &size, double scaling, CursorMode mode);
+    void virtualOutputScreencastRequested(ScreencastStreamV1Interface *stream, const QString &name, const QString &description, const QSize &size, double scaling, CursorMode mode);
     void windowScreencastRequested(ScreencastStreamV1Interface *stream, const QString &winid, CursorMode mode);
     void regionScreencastRequested(ScreencastStreamV1Interface *stream, const QRect &geometry, qreal scaling, CursorMode mode);