data-device: keep track of wlr_data_offer in wlr_seat lists

include/wlr/types/wlr_data_device.h

@@ -44,6 +44,7 @@ struct wlr_data_offer {
 	struct wl_resource *resource;
 	struct wlr_data_source *source;
 	enum wlr_data_offer_type type;
+	struct wl_list link; // wlr_seat::{selection_offers,drag_offers}
 
 	uint32_t actions;
 	enum wl_data_device_manager_dnd_action preferred_action;

include/wlr/types/wlr_seat.h

@@ -197,6 +197,7 @@ struct wlr_seat {
 
 	struct wlr_data_source *selection_source;
 	uint32_t selection_serial;
+	struct wl_list selection_offers; // wlr_data_offer::link
 
 	struct wlr_primary_selection_source *primary_selection_source;
 	uint32_t primary_selection_serial;
@@ -205,6 +206,7 @@ struct wlr_seat {
 	struct wlr_drag *drag;
 	struct wlr_data_source *drag_source;
 	uint32_t drag_serial;
+	struct wl_list drag_offers; // wlr_data_offer::link
 
 	struct wlr_seat_pointer_state pointer_state;
 	struct wlr_seat_keyboard_state keyboard_state;

types/data_device/wlr_data_offer.c

@@ -181,9 +181,11 @@ void data_offer_destroy(struct wlr_data_offer *offer) {
 	}
 
 	wl_list_remove(&offer->source_destroy.link);
+	wl_list_remove(&offer->link);
 
 	// Make the resource inert
 	wl_resource_set_user_data(offer->resource, NULL);
+
 	free(offer);
 }
 
@@ -232,6 +234,15 @@ struct wlr_data_offer *data_offer_create(struct wl_resource *device_resource,
 	wl_resource_set_implementation(offer->resource, &data_offer_impl, offer,
 		data_offer_handle_resource_destroy);
 
+	switch (type) {
+	case WLR_DATA_OFFER_SELECTION:
+		wl_list_insert(&seat_client->seat->selection_offers, &offer->link);
+		break;
+	case WLR_DATA_OFFER_DRAG:
+		wl_list_insert(&seat_client->seat->drag_offers, &offer->link);
+		break;
+	}
+
 	offer->source_destroy.notify = data_offer_handle_source_destroy;
 	wl_signal_add(&source->events.destroy, &offer->source_destroy);
 

types/seat/wlr_seat.c

@@ -267,6 +267,8 @@ struct wlr_seat *wlr_seat_create(struct wl_display *display, const char *name) {
 	seat->name = strdup(name);
 	wl_list_init(&seat->clients);
 	wl_list_init(&seat->drag_icons);
+	wl_list_init(&seat->selection_offers);
+	wl_list_init(&seat->drag_offers);
 
 	wl_signal_init(&seat->events.start_drag);
 	wl_signal_init(&seat->events.new_drag_icon);