[gtk: 1/2] gtk#767 add a way to change the application_id of a toplevel wayland GdkSurface

[Matthias Clasen <matthiasc src gnome org>]

commit 7e97c2513f12392ad043fa8e64352f82b31e54b8
Author: Caolán McNamara <caolanm redhat com>
Date:   Tue Jul 7 15:45:30 2020 +0100

    gtk#767 add a way to change the application_id of a toplevel wayland GdkSurface
    
    so LibreOffice can reuse toplevels and get the right task icons
    
    references;
     https://gitlab.gnome.org/GNOME/gtk/-/issues/767
     https://lists.freedesktop.org/archives/wayland-devel/2019-July/040704.html
     https://gitlab.freedesktop.org/wayland/wayland-protocols/commit/e0d6ad1d5e7e80321285a9b14ca3329289eb02e6
     https://bugs.documentfoundation.org/show_bug.cgi?id=125934
     https://bugzilla.redhat.com/show_bug.cgi?id=1334915
     https://bugreports.qt.io/browse/QTBUG-77182

 gdk/wayland/gdksurface-wayland.c | 46 ++++++++++++++++++++++++++++------------
 gdk/wayland/gdkwaylandsurface.h  |  4 ++++
 2 files changed, 37 insertions(+), 13 deletions(-)
---
diff --git a/gdk/wayland/gdksurface-wayland.c b/gdk/wayland/gdksurface-wayland.c
index 8f8b791f88..ef3f277664 100644
--- a/gdk/wayland/gdksurface-wayland.c
+++ b/gdk/wayland/gdksurface-wayland.c
@@ -1648,6 +1648,38 @@ create_zxdg_toplevel_v6_resources (GdkSurface *surface)
                                  surface);
 }
 
+void
+gdk_wayland_surface_set_application_id (GdkSurface *surface, const char* application_id)
+{
+  GdkWaylandSurface *impl;
+  GdkWaylandDisplay *display_wayland;
+
+  g_return_if_fail (application_id != NULL);
+
+  if (GDK_SURFACE_DESTROYED (surface))
+    return;
+
+  if (!is_realized_toplevel (surface))
+    return;
+
+  display_wayland = GDK_WAYLAND_DISPLAY (gdk_surface_get_display (surface));
+  impl = GDK_WAYLAND_SURFACE (surface);
+
+  switch (display_wayland->shell_variant)
+    {
+    case GDK_WAYLAND_SHELL_VARIANT_XDG_SHELL:
+      xdg_toplevel_set_app_id (impl->display_server.xdg_toplevel,
+                               application_id);
+      break;
+    case GDK_WAYLAND_SHELL_VARIANT_ZXDG_SHELL_V6:
+      zxdg_toplevel_v6_set_app_id (impl->display_server.zxdg_toplevel_v6,
+                                   application_id);
+      break;
+    default:
+      g_assert_not_reached ();
+    }
+}
+
 static void
 gdk_wayland_surface_create_xdg_toplevel (GdkSurface *surface)
 {
@@ -1702,19 +1734,7 @@ gdk_wayland_surface_create_xdg_toplevel (GdkSurface *surface)
   if (app_id == NULL)
     app_id = "GTK+ Application";
 
-  switch (display_wayland->shell_variant)
-    {
-    case GDK_WAYLAND_SHELL_VARIANT_XDG_SHELL:
-      xdg_toplevel_set_app_id (impl->display_server.xdg_toplevel,
-                               app_id);
-      break;
-    case GDK_WAYLAND_SHELL_VARIANT_ZXDG_SHELL_V6:
-      zxdg_toplevel_v6_set_app_id (impl->display_server.zxdg_toplevel_v6,
-                                   app_id);
-      break;
-    default:
-      g_assert_not_reached ();
-    }
+  gdk_wayland_surface_set_application_id (surface, app_id);
 
   maybe_set_gtk_surface_dbus_properties (surface);
   maybe_set_gtk_surface_modal (surface);
diff --git a/gdk/wayland/gdkwaylandsurface.h b/gdk/wayland/gdkwaylandsurface.h
index 57decfcf3d..4af358c33e 100644
--- a/gdk/wayland/gdkwaylandsurface.h
+++ b/gdk/wayland/gdkwaylandsurface.h
@@ -74,6 +74,10 @@ GDK_AVAILABLE_IN_ALL
 gboolean                 gdk_wayland_surface_set_transient_for_exported (GdkSurface *surface,
                                                                          char      *parent_handle_str);
 
+GDK_AVAILABLE_IN_ALL
+void                     gdk_wayland_surface_set_application_id (GdkSurface *surface,
+                                                                 const char *application_id);
+
 void gdk_wayland_surface_announce_csd                        (GdkSurface *surface);
 
 G_END_DECLS