[mutter/gnome-3-36] wayland: Send primary offer to all data devices from the same client

[Robert Mader <rmader src gnome org>]

commit d7217504171dec7f21df66858e46c5a527148d76
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.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1253
    
    (cherry picked from commit b45d5ef3f5a497703fd2c77b7088249cbf3ef367)

 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 8326492a6d..c8db576dbc 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 401dae8537..77fcbf97ea 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;