[mutter] wayland: Emit signal on primary selection data source destruction

[Carlos Garnacho <carlosg src gnome org>]

commit da28d7a01212960421cfa8f1b68e6db865460bb7
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Mar 2 16:37:27 2016 +0100

    wayland: Emit signal on primary selection data source destruction
    
    This is necessary for the X11 side to catch up, and unset the primary
    selection ownership on our window that represents the wayland side in
    X11 selection.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=760745

 src/wayland/meta-wayland-data-device.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/wayland/meta-wayland-data-device.c b/src/wayland/meta-wayland-data-device.c
index b06d03d..5b0a7c4 100644
--- a/src/wayland/meta-wayland-data-device.c
+++ b/src/wayland/meta-wayland-data-device.c
@@ -1515,6 +1515,8 @@ primary_source_destroyed (gpointer  data,
       if (data_device_resource)
         gtk_primary_selection_device_send_selection (data_device_resource, NULL);
     }
+
+  wl_signal_emit (&data_device->primary_ownership_signal, NULL);
 }
 
 void