Add a PlasmaShellSurfaceInterface getter

This allows to simplify some compositor code.

src/wayland/plasmashell_interface.cpp

@@ -15,14 +15,13 @@ namespace KWaylandServer
 {
 
 static const quint32 s_version = 6;
+static QList<PlasmaShellSurfaceInterface *> s_shellSurfaces;
 
 class PlasmaShellInterfacePrivate : public QtWaylandServer::org_kde_plasma_shell
 {
 public:
     PlasmaShellInterfacePrivate(PlasmaShellInterface *q, Display *display);
 
-    QList<PlasmaShellSurfaceInterface *> shellSurfaces;
-
 private:
     void org_kde_plasma_shell_get_surface(Resource * resource, uint32_t id, struct ::wl_resource *surface) override;
     PlasmaShellInterface *q;
@@ -79,10 +78,7 @@ void PlasmaShellInterfacePrivate::org_kde_plasma_shell_get_surface(QtWaylandServ
         return;
     }
 
-    auto it = std::find_if(shellSurfaces.constBegin(), shellSurfaces.constEnd(), [&s](PlasmaShellSurfaceInterface *shellSurface) {
-        return shellSurface->surface() == s;
-    });
-    if (it != shellSurfaces.constEnd()) {
+    if (PlasmaShellSurfaceInterface::get(s)) {
         wl_resource_post_error(resource->handle, 0, "org_kde_plasma_shell_surface already exists");
         return;
     }
@@ -90,10 +86,10 @@ void PlasmaShellInterfacePrivate::org_kde_plasma_shell_get_surface(QtWaylandServ
     wl_resource *shell_resource = wl_resource_create(resource->client(), &org_kde_plasma_surface_interface, resource->version(), id);
 
     auto shellSurface = new PlasmaShellSurfaceInterface(s, shell_resource);
-    shellSurfaces.append(shellSurface);
+    s_shellSurfaces.append(shellSurface);
 
-    QObject::connect(shellSurface, &QObject::destroyed, q, [this, shellSurface]() {
-        shellSurfaces.removeOne(shellSurface);
+    QObject::connect(shellSurface, &QObject::destroyed, [shellSurface]() {
+        s_shellSurfaces.removeOne(shellSurface);
     });
 
     emit q->surfaceCreated(shellSurface);
@@ -310,4 +306,14 @@ PlasmaShellSurfaceInterface *PlasmaShellSurfaceInterface::get(wl_resource *nativ
     return nullptr;
 }
 
+PlasmaShellSurfaceInterface *PlasmaShellSurfaceInterface::get(SurfaceInterface *surface)
+{
+    for (PlasmaShellSurfaceInterface *shellSurface : qAsConst(s_shellSurfaces)) {
+        if (shellSurface->surface() == surface) {
+            return shellSurface;
+        }
+    }
+    return nullptr;
+}
+
 }

src/wayland/plasmashell_interface.h

@@ -153,6 +153,7 @@ public:
      * @returns The PlasmaShellSurfaceInterface for the @p native resource.
      */
     static PlasmaShellSurfaceInterface *get(wl_resource *native);
+    static PlasmaShellSurfaceInterface *get(SurfaceInterface *surface);
 
 Q_SIGNALS:
     /**