[mutter/wip/carlosg/broadcast-offers: 2/2] wayland: Send primary offer to all data devices from the same client

[Carlos Garnacho <carlosg src gnome org>]

commit caf3ab507a112ae6b465ef88c6e8a7258d1ce0d2
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed May 13 16:39:44 2020 +0200

    wayland: Send primary offer to all data devices from the same client
    
    Make the data device track the keyboard focus, and use that list to
    forward the primary selection to all data devices from the same
    client.

 src/wayland/meta-wayland-data-device-primary.c | 39 ++++++++++++++++++++++----
 src/wayland/meta-wayland-data-device-primary.h |  1 +
 2 files changed, 34 insertions(+), 6 deletions(-)
---
diff --git a/src/wayland/meta-wayland-data-device-primary.c b/src/wayland/meta-wayland-data-device-primary.c
index 8326492a6..c8db576db 100644
--- a/src/wayland/meta-wayland-data-device-primary.c
+++ b/src/wayland/meta-wayland-data-device-primary.c
@@ -41,6 +41,30 @@
 static struct wl_resource * create_and_send_primary_offer   (MetaWaylandDataDevicePrimary *data_device,
                                                              struct wl_resource           *target);
 
+static void
+move_resources (struct wl_list *destination,
+                struct wl_list *source)
+{
+  wl_list_insert_list (destination, source);
+  wl_list_init (source);
+}
+
+static void
+move_resources_for_client (struct wl_list   *destination,
+                          struct wl_list   *source,
+                          struct wl_client *client)
+{
+  struct wl_resource *resource, *tmp;
+  wl_resource_for_each_safe (resource, tmp, source)
+    {
+      if (wl_resource_get_client (resource) == client)
+        {
+          wl_list_remove (wl_resource_get_link (resource));
+          wl_list_insert (destination, wl_resource_get_link (resource));
+        }
+    }
+}
+
 static void
 unbind_resource (struct wl_resource *resource)
 {
@@ -175,10 +199,7 @@ owner_changed_cb (MetaSelection                *selection,
 
   if (selection_type == META_SELECTION_PRIMARY)
     {
-      data_device_resource =
-        wl_resource_find_for_client (&data_device->resource_list,
-                                     focus_client);
-      if (data_device_resource)
+      wl_resource_for_each (data_device_resource, &data_device->focus_resource_list)
         {
           struct wl_resource *offer = NULL;
 
@@ -270,6 +291,7 @@ void
 meta_wayland_data_device_primary_init (MetaWaylandDataDevicePrimary *data_device)
 {
   wl_list_init (&data_device->resource_list);
+  wl_list_init (&data_device->focus_resource_list);
 }
 
 static struct wl_resource *
@@ -312,12 +334,17 @@ meta_wayland_data_device_primary_set_keyboard_focus (MetaWaylandDataDevicePrimar
     return;
 
   data_device->focus_client = focus_client;
+  move_resources (&data_device->resource_list,
+                  &data_device->focus_resource_list);
 
   if (!focus_client)
     return;
 
-  data_device_resource = wl_resource_find_for_client (&data_device->resource_list, focus_client);
-  if (data_device_resource)
+  move_resources_for_client (&data_device->focus_resource_list,
+                             &data_device->resource_list,
+                             focus_client);
+
+  wl_resource_for_each (data_device_resource, &data_device->focus_resource_list)
     {
       struct wl_resource *offer;
       offer = create_and_send_primary_offer (data_device, data_device_resource);
diff --git a/src/wayland/meta-wayland-data-device-primary.h b/src/wayland/meta-wayland-data-device-primary.h
index 401dae853..77fcbf97e 100644
--- a/src/wayland/meta-wayland-data-device-primary.h
+++ b/src/wayland/meta-wayland-data-device-primary.h
@@ -38,6 +38,7 @@ struct _MetaWaylandDataDevicePrimary
   uint32_t serial;
   MetaWaylandDataSource *data_source;
   struct wl_list resource_list;
+  struct wl_list focus_resource_list;
   struct wl_client *focus_client;
 
   guint selection_owner_signal_id;