[gtk+/gtk-3-22] wayland: Set startup ID from GApplication platform data

[Matthias Clasen <matthiasc src gnome org>]

commit 0bccddb2ffecd19eae74c8a053cac1b80353b197
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Oct 10 12:33:54 2016 +0200

    wayland: Set startup ID from GApplication platform data
    
    The GApplication platform data may contain a startup ID that on X11
    is used to set the startup notification ID when activated. Do the
    same on the wayland backend to make startup notifications work for
    DBus-activated applications where the DESKTOP_STARTUP_ID environment
    variable is not set.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=768531

 gtk/gtkapplication-wayland.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkapplication-wayland.c b/gtk/gtkapplication-wayland.c
index 84df82c..221a1ad 100644
--- a/gtk/gtkapplication-wayland.c
+++ b/gtk/gtkapplication-wayland.c
@@ -61,6 +61,17 @@ gtk_application_impl_wayland_handle_window_realize (GtkApplicationImpl *impl,
 }
 
 static void
+gtk_application_impl_wayland_before_emit (GtkApplicationImpl *impl,
+                                          GVariant           *platform_data)
+{
+  const char *startup_notification_id = NULL;
+
+  g_variant_lookup (platform_data, "desktop-startup-id", "&s", &startup_notification_id);
+
+  gdk_wayland_display_set_startup_notification_id (gdk_display_get_default (), startup_notification_id);
+}
+
+static void
 gtk_application_impl_wayland_init (GtkApplicationImplWayland *wayland)
 {
 }
@@ -72,4 +83,6 @@ gtk_application_impl_wayland_class_init (GtkApplicationImplWaylandClass *class)
 
   impl_class->handle_window_realize =
     gtk_application_impl_wayland_handle_window_realize;
+  impl_class->before_emit =
+    gtk_application_impl_wayland_before_emit;
 }