wayland: Explicitly announce ssd for kwin

Without this, kwin correctly assumes that we are
using client-side decorations. This is a port
of 32ae97f1 from GTK 3.24.

Fixes: #3609

2 files changed, 19 insertions, 0 deletions

diff --git a/gdk/wayland/gdksurface-wayland.c b/gdk/wayland/gdksurface-wayland.c
index c114c04f29..0fd1b82a9b 100644
--- a/gdk/wayland/gdksurface-wayland.c
+++ b/gdk/wayland/gdksurface-wayland.c
@@ -2223,6 +2223,24 @@ gdk_wayland_toplevel_announce_csd (GdkToplevel *toplevel)
                                                 ORG_KDE_KWIN_SERVER_DECORATION_MANAGER_MODE_CLIENT);
 }
 
+void
+gdk_wayland_toplevel_announce_ssd (GdkToplevel *toplevel)
+{
+  GdkWaylandDisplay *display_wayland = GDK_WAYLAND_DISPLAY (gdk_surface_get_display (GDK_SURFACE (toplevel)));
+  GdkWaylandSurface *impl = GDK_WAYLAND_SURFACE (toplevel);
+
+  g_return_if_fail (GDK_IS_WAYLAND_TOPLEVEL (toplevel));
+
+  if (!display_wayland->server_decoration_manager)
+    return;
+  impl->display_server.server_decoration =
+    org_kde_kwin_server_decoration_manager_create (display_wayland->server_decoration_manager,
+                                                  impl->display_server.wl_surface);
+  if (impl->display_server.server_decoration)
+    org_kde_kwin_server_decoration_request_mode (impl->display_server.server_decoration,
+                                                ORG_KDE_KWIN_SERVER_DECORATION_MANAGER_MODE_SERVER);
+}
+
 gboolean
 gdk_wayland_toplevel_inhibit_idle (GdkToplevel *toplevel)
 {
diff --git a/gdk/wayland/gdksurface-wayland.h b/gdk/wayland/gdksurface-wayland.h
index b0d0d6fc19..8efa4be04d 100644
--- a/gdk/wayland/gdksurface-wayland.h
+++ b/gdk/wayland/gdksurface-wayland.h
@@ -33,6 +33,7 @@ void                     gdk_wayland_toplevel_set_dbus_properties       (GdkTopl
                                                                          const char  *unique_bus_name);
 
 void                     gdk_wayland_toplevel_announce_csd              (GdkToplevel *toplevel);
+void                     gdk_wayland_toplevel_announce_ssd              (GdkToplevel *toplevel);
 
 gboolean                 gdk_wayland_toplevel_inhibit_idle              (GdkToplevel *toplevel);
 void                     gdk_wayland_toplevel_uninhibit_idle            (GdkToplevel *toplevel);